| lumpiness | (noun) The property of being full of lumps, not being smooth. | - |
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| lupin | (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupine |
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| lupine | (adjective) of or relating to or characteristic of wolves | - |
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| (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupin |
| luteotropin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, prolactin |
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| lynchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: linchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, linchpin, mainstay |
| mapinguari | (noun) supposed human-sized sloth-like creature reportedly sighted by Indians in the Amazon rain forest | - |
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| mapping | (noun) (genetics) the process of locating genes on a chromosome | Synonyms: chromosome mapping |
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| (noun) the process of making maps | - |
| (noun) (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function) | Synonyms: function, map, mathematical function, single-valued function |
| minesweeping | (noun) the activity of detecting and disposing of marine mines | - |
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| mopping | (noun) cleaning with a mop | Synonyms: swabbing |
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| napping | (adjective) not prepared or vigilant | Synonyms: off-guard, off guard, off her guard, off his guard, off one's guard, off your guard |
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| nevirapine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Viramune) used to treat AIDS and HIV | Synonyms: Viramune |
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| nifedipine | (noun) calcium blocker (trade name Procardia); appears to increase the risk of recurrent heart attacks | Synonyms: Procardia |
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| ninepin | (noun) a bowling pin of the type used in playing ninepins or (in England) skittles | Synonyms: skittle, skittle pin |
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| ninepins | (noun) a bowling game that is played by rolling a bowling ball down a bowling alley at a target of nine wooden pins | Synonyms: skittles |
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| nipping | (adjective) pleasantly cold and invigorating | Synonyms: crisp, frosty, nippy, snappy |
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| (adjective) capable of wounding | Synonyms: barbed, biting, mordacious, pungent |
| nontelescoping | (adjective) not telescopic | Synonyms: nontelescopic |
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| norepinephrine | (noun) a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses | Synonyms: noradrenaline |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| opine | (verb) expect, believe, or suppose | Synonyms: guess, imagine, reckon, suppose, think |
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| (verb) express one's opinion openly and without fear or hesitation | Synonyms: animadvert, sound off, speak out, speak up |
| opinion | (noun) the reason for a court's judgment (as opposed to the decision itself) | Synonyms: ruling |
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| (noun) a personal belief or judgment that is not founded on proof or certainty | Synonyms: persuasion, sentiment, thought, view |
| (noun) a belief or sentiment shared by most people; the voice of the people | Synonyms: popular opinion, public opinion, vox populi |
| (noun) a vague idea in which some confidence is placed | Synonyms: belief, feeling, impression, notion |
| (noun) the legal document stating the reasons for a judicial decision | Synonyms: judgement, judgment, legal opinion |
| (noun) a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof | Synonyms: view |
| opinionated | (adjective) obstinate in your opinions | Synonyms: opinionative, self-opinionated |
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| opinionative | (adjective) obstinate in your opinions | Synonyms: opinionated, self-opinionated |
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| orpin | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpine, Sedum telephium |
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| orpine | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpin, Sedum telephium |
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| outcropping | (noun) the part of a rock formation that appears above the surface of the surrounding land | Synonyms: outcrop, rock outcrop |
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| overlapping | (noun) covering with a design in which one element covers a part of another (as with tiles or shingles) | Synonyms: imbrication, lapping |
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| paripinnate | (adjective) (of a leaf shape) pinnate with a pair of leaflets at the apex | Synonyms: abruptly-pinnate, even-pinnate |
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| peacekeeping | (adjective) of or relating to the preservation of peace between hostile groups by international military forces | - |
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| (noun) the activity of keeping the peace by military forces (especially when international military forces enforce a truce between hostile groups or nations) | Synonyms: peacekeeping mission, peacekeeping operation |
| peppiness | (noun) liveliness and energy | Synonyms: ginger, pep |
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| pilocarpine | (noun) cholinergic alkaloid used in eyedrops to treat glaucoma | - |
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| pin | (noun) a small slender (often pointed) piece of wood or metal used to support or fasten or attach things | - |
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| (noun) a piece of jewelry that is pinned onto the wearer's garment | - |
| (noun) axis consisting of a short shaft that supports something that turns | Synonyms: pivot |
| (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: oarlock, peg, rowlock, thole, tholepin |
| (noun) a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target | Synonyms: bowling pin |
| (noun) flagpole used to mark the position of the hole on a golf green | Synonyms: flag |
| (noun) cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown | Synonyms: pin tumbler |
| (noun) informal terms for the leg | Synonyms: peg, stick |
| (noun) small markers inserted into a surface to mark scores or define locations etc. | Synonyms: peg |
| (noun) when a wrestler's shoulders are forced to the mat | Synonyms: fall |
| (verb) (chess) immobilize a piece | - |
| (verb) attach or fasten with pins | - |
| (verb) pierce with a pin | - |
| (verb) to hold fast or prevent from moving | Synonyms: immobilise, immobilize, trap |
| pinafore | (noun) a sleeveless dress resembling an apron; worn over other clothing | Synonyms: jumper, pinny |
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| pinata | (noun) plaything consisting of a container filled with toys and candy; suspended from a height for blindfolded children to break with sticks | - |
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| pinball | (noun) a game played on a sloping board; the object is to propel marbles against pins or into pockets | Synonyms: pinball game |
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| pincer | (noun) a grasping structure on the limb of a crustacean or other arthropods | Synonyms: chela, claw, nipper |
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| (noun) a hand tool for holding consisting of a compound lever for grasping | Synonyms: pair of pincers, pair of tweezers, tweezer |
| pinch | (noun) a squeeze with the fingers | Synonyms: tweak |
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| (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: apprehension, arrest, catch, collar, taking into custody |
| (noun) a small sharp bite or snip | Synonyms: nip |
| (noun) a sudden unforeseen crisis (usually involving danger) that requires immediate action | Synonyms: emergency, exigency |
| (noun) a slight but appreciable amount | Synonyms: hint, jot, mite, soupcon, speck, tinge, touch |
| (noun) an injury resulting from getting some body part squeezed | - |
| (noun) a painful or straitened circumstance | - |
| (verb) irritate as if by a nip, pinch, or tear | Synonyms: vellicate |
| (verb) squeeze tightly between the fingers | Synonyms: nip, squeeze, tweet, twinge, twitch |
| (verb) make ridges into by pinching together | Synonyms: crimp |
| (verb) cut the top off | Synonyms: top |
| (verb) make off with belongings of others | Synonyms: abstract, cabbage, filch, hook, lift, nobble, pilfer, purloin, snarf, sneak, swipe |
| pinchbeck | (adjective) serving as an imitation or substitute | - |
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| (noun) an alloy of copper and zinc that is used in cheap jewelry to imitate gold | - |
| pinche | (noun) South American tamarin with a tufted head | Synonyms: Leontocebus oedipus |
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| pinched | (adjective) as if squeezed uncomfortably tight | - |
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| (adjective) sounding as if the nose were pinched | Synonyms: adenoidal, nasal |
| (adjective) not having enough money to pay for necessities | Synonyms: hard up, impecunious, in straitened circumstances, penniless, penurious |
| (adjective) very thin especially from disease or hunger or cold | Synonyms: cadaverous, emaciated, gaunt, haggard, skeletal, wasted |
| pinchgut | (noun) a niggardly person who starves himself (and others) | - |
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| pincushion | (noun) a small stiff cushion into which pins are stuck ready for use | - |
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| pindolol | (noun) an oral beta blocker (trade name Visken) used in treating hypertension | Synonyms: Visken |
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| pine | (noun) a coniferous tree | Synonyms: pine tree, true pine |
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| (noun) straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus | - |
| (verb) have a desire for something or someone who is not present | Synonyms: ache, languish, yearn, yen |
| pineal | (adjective) relating to the pineal body | - |
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| (adjective) having the form of a pine cone | - |
| pinealoma | (noun) tumor of the pineal gland | - |
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| pineapple | (noun) large sweet fleshy tropical fruit with a terminal tuft of stiff leaves; widely cultivated | Synonyms: ananas |
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| (noun) a tropical American plant bearing a large fleshy edible fruit with a terminal tuft of stiff leaves; widely cultivated in the tropics | Synonyms: Ananas comosus, pineapple plant |
| pinecone | (noun) the seed-producing cone of a pine tree | - |
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| pinesap | (noun) fleshy tawny or reddish saprophytic herb resembling the Indian pipe and growing in woodland humus of eastern North America; in some classifications placed in a separate genus Hypopitys | Synonyms: false beachdrops, Monotropa hypopithys |
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| pinetum | (noun) an area planted with pine trees or related conifers | - |
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| pineweed | (noun) annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers | Synonyms: Hypericum gentianoides, nitweed, orange grass, pine-weed |
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| pinfish | (noun) similar to sea bream; small spiny-finned fish found in bays along the southeastern coast of the United States | Synonyms: Lagodon rhomboides, sailor's-choice, squirrelfish |
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| pinfold | (noun) a pen where stray animals are confined | - |
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| ping | (noun) a sharp high-pitched resonant sound (as of a sonar echo or a bullet striking metal) | - |
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| (verb) send a message from one computer to another to check whether it is reachable and active | - |
| (verb) contact, usually in order to remind of something | - |
| (verb) hit with a pinging noise | - |
| (verb) make a short high-pitched sound | - |
| (verb) sound like a car engine that is firing too early | Synonyms: knock, pink |
| pinger | (noun) a pulse generator used for echo sounding in sonar | - |
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| pinguecula | (noun) a slightly elevated elastic tissue deposit in the conjunctiva that may extend to the cornea but does not cover it | - |
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| pinhead | (noun) the head of a pin | - |
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| (noun) an ignorant or foolish person | Synonyms: boob, booby, dope, dumbbell, dummy |
| pinhole | (noun) a small puncture that might have been made by a pin | - |
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| pining | (noun) a feeling of deep longing | - |
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| pinion | (noun) wing of a bird | Synonyms: pennon |
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| (noun) any of the larger wing or tail feathers of a bird | Synonyms: flight feather, quill, quill feather |
| (noun) a gear with a small number of teeth designed to mesh with a larger wheel or rack | - |
| (verb) cut the wings off (of birds) | - |
| (verb) bind the arms of | Synonyms: shackle |
| pinioned | (adjective) bound fast especially having the arms restrained | - |
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| (adjective) (of birds) especially having the flight feathers | - |
| pinite | (noun) grey or green or brown mineral similar to mica and containing aluminum and potassium sulphates | - |
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| pink | (adjective) of a light shade of red | Synonyms: pinkish |
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| (noun) a light shade of red | - |
| (noun) a person with mildly leftist political views | Synonyms: pinko |
| (noun) any of various flowers of plants of the genus Dianthus cultivated for their fragrant flowers | Synonyms: garden pink |
| (verb) cut in a zigzag pattern with pinking shears, in sewing | - |
| (verb) make light, repeated taps on a surface | Synonyms: knock, rap, tap |
| (verb) sound like a car engine that is firing too early | Synonyms: knock, ping |
| pinkeye | (noun) inflammation of the conjunctiva of the eye | Synonyms: conjunctivitis |
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| pinkie | (noun) the finger farthest from the thumb | Synonyms: little finger, pinky |
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| pinkify | (verb) make pink | - |
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| pinkish | (adjective) of a light shade of red | Synonyms: pink |
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| pinkness | (noun) the quality of being pink | - |
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| pinko | (noun) a person with mildly leftist political views | Synonyms: pink |
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| pinkroot | (noun) a fungal disease of onions | - |
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| pinky | (noun) the finger farthest from the thumb | Synonyms: little finger, pinkie |
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| pinna | (noun) the externally visible cartilaginous structure of the external ear | Synonyms: auricle, ear |
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| (noun) division of a usually pinnately divided leaf | Synonyms: pinnule |
| pinnace | (noun) a boat for communication between ship and shore | Synonyms: cutter, ship's boat, tender |
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| pinnacle | (noun) (architecture) a slender upright spire at the top of a buttress or tower | - |
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| (noun) a lofty peak | - |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, meridian, peak, summit, superlative, tiptop, top |
| (verb) raise on or as if on a pinnacle | - |
| (verb) surmount with a pinnacle | - |
| pinnate | (adjective) (of a leaf shape) featherlike; having leaflets on each side of a common axis | Synonyms: pinnated |
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| pinnated | (adjective) (of a leaf shape) featherlike; having leaflets on each side of a common axis | Synonyms: pinnate |
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| pinnately | (adverb) having a pinnate shape | - |
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| pinnatifid | (adjective) (of a leaf shape) cleft nearly to the midrib in broad divisions not separated into distinct leaflets | - |
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| pinnatiped | (noun) aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers | Synonyms: pinniped, pinniped mammal |
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| pinnatisect | (adjective) (of a leaf shape) cleft nearly to the midrib in narrow divisions not separated into distinct leaflets | - |
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| pinner | (noun) a woman's cap with two long flaps pinned on | - |
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| pinning | (noun) a mutual promise of a couple not to date anyone else; on college campuses it was once signaled by the giving of a fraternity pin | - |
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| pinniped | (noun) aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers | Synonyms: pinnatiped, pinniped mammal |
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| pinnule | (noun) division of a usually pinnately divided leaf | Synonyms: pinna |
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| pinny | (noun) a sleeveless dress resembling an apron; worn over other clothing | Synonyms: jumper, pinafore |
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| pinochle | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: bezique, penuchle, pinocle |
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| pinocle | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: bezique, penuchle, pinochle |
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| pinocytosis | (noun) process by which certain cells can engulf and incorporate droplets of fluid | - |
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| pinole | (noun) meal made of finely ground corn mixed with sugar and spices | - |
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| pinon | (noun) any of several low-growing pines of western North America | Synonyms: pinyon |
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| pinpoint | (noun) the sharp point of a pin | - |
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| (noun) a very small spot | Synonyms: speck |
| (noun) a very brief moment | - |
| (verb) locate exactly | Synonyms: nail |
| pinprick | (noun) small puncture (as if made by a pin) | - |
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| (noun) a minor annoyance | - |
| pinscher | (noun) any of three breeds of dogs whose ears and tail are usually cropped | - |
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| pinstripe | (noun) a very thin stripe (especially a white stripe on a dark fabric) | - |
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| (noun) a fabric with very thin stripes | - |
| (noun) a suit made from a fabric with very thin stripes | - |
| pinstriped | (adjective) having very thin stripes | - |
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| pint | (noun) a United States liquid unit equal to 16 fluid ounces; two pints equal one quart | - |
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| (noun) a British imperial capacity measure (liquid or dry) equal to 4 gills or 568.26 cubic centimeters | - |
| (noun) a United States dry unit equal to 0.5 quart or 33.6 cubic inches | Synonyms: dry pint |
| pintado | (noun) large edible mackerel of temperate United States coastal Atlantic waters | Synonyms: cero, kingfish, Scomberomorus regalis |
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| pintail | (noun) long-necked river duck of the Old and New Worlds having elongated central tail feathers | Synonyms: Anas acuta, pin-tailed duck |
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| pintle | (noun) a pin or bolt forming the pivot of a hinge | - |
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| pinto | (noun) a spotted or calico horse or pony | - |
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| pinwheel | (noun) a circular firework that spins round and round emitting colored fire | Synonyms: catherine wheel |
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| (noun) a toy consisting of vanes of colored paper or plastic that is pinned to a stick and spins when it is pointed into the wind | Synonyms: pinwheel wind collector |
| (noun) a wheel that has numerous pins that are set at right angles to its rim | - |
| (noun) perennial subshrub of Tenerife having leaves in rosettes resembling pinwheels | Synonyms: Aeonium haworthii |