| abbot | (noun) the superior of an abbey of monks | Synonyms: archimandrite |
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| aboard | (adverb) on first or second or third base | - |
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| (adverb) on a ship, train, plane or other vehicle | Synonyms: on board |
| (adverb) part of a group | - |
| (adverb) side by side | Synonyms: alongside |
| abocclusion | (noun) the condition in which the upper teeth do not touch the lower teeth when biting | - |
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| abode | (noun) housing that someone is living in | Synonyms: domicile, dwelling, dwelling house, habitation, home |
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| (noun) any address at which you dwell more than temporarily | Synonyms: residence |
| abohm | (noun) a unit of resistance equal to a billionth of an ohm | - |
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| abolish | (verb) do away with | Synonyms: get rid of |
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| abolishable | (adjective) capable of being abolished | - |
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| abolishment | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolition |
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| abolition | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolishment |
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| abolitionary | (adjective) relating to or favoring abolition, especially abolition of slavery | - |
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| abolitionism | (noun) the doctrine that calls for the abolition of slavery | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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| abomasal | (adjective) relating to the abomasum (the fourth compartment of the stomach of ruminants) | - |
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| abomasum | (noun) the fourth compartment of the stomach of a ruminant; the one where digestion takes place | Synonyms: fourth stomach |
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| abominable | (adjective) exceptionally bad or displeasing | Synonyms: atrocious, awful, dreadful, painful, terrible, unspeakable |
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| (adjective) unequivocally detestable | Synonyms: detestable, execrable, odious |
| abominably | (adverb) in a terrible manner | Synonyms: abysmally, atrociously, awfully, rottenly, terribly |
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| (adverb) in an offensive and hateful manner | Synonyms: detestably, odiously, repulsively |
| abominate | (verb) find repugnant | Synonyms: abhor, execrate, loathe |
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| abomination | (noun) an action that is vicious or vile; an action that arouses disgust or abhorrence | - |
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| (noun) hate coupled with disgust | Synonyms: abhorrence, detestation, execration, loathing, odium |
| (noun) a person who is loathsome or disgusting | - |
| abominator | (noun) one who hates or loathes | Synonyms: loather |
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| aborad | (adverb) away from the mouth or oral region | - |
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| aboral | (adjective) opposite to or away from the mouth | - |
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| aboriginal | (adjective) characteristic of or relating to people inhabiting a region from the beginning | Synonyms: native |
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| (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: primaeval, primal, primeval, primordial |
| (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| abort | (noun) the act of terminating a project or procedure before it is completed | - |
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| (verb) terminate a pregnancy by undergoing an abortion | - |
| (verb) cease development, die, and be aborted | - |
| (verb) terminate before completion | - |
| aborticide | (noun) the act of destroying a fetus | Synonyms: feticide |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: abortifacient, abortion-inducing drug |
| abortifacient | (adjective) causing abortion | - |
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| (noun) a drug (or other chemical agent) that causes abortion | Synonyms: aborticide, abortion-inducing drug |
| abortion | (noun) termination of pregnancy | - |
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| (noun) failure of a plan | Synonyms: miscarriage |
| abortionist | (noun) a person (who should be a doctor) who terminates pregnancies | - |
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| abortive | (adjective) failing to accomplish an intended result | Synonyms: stillborn, unsuccessful |
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| abortively | (adverb) in an unfruitful manner | - |
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| abortus | (noun) a human fetus whose weight is less than 0.5 kilogram when removed or expelled from the mother's body | - |
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| aboulia | (noun) a loss of will power | Synonyms: abulia |
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| aboulic | (adjective) suffering from abulia; showing abnormal inability to act or make decisions | Synonyms: abulic |
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| abound | (verb) be abundant or plentiful; exist in large quantities | - |
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| (verb) be in a state of movement or action | Synonyms: bristle, burst |
| abounding | (adjective) existing in abundance | Synonyms: galore |
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| about | (adjective) on the move | Synonyms: astir |
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| (adverb) (of quantities) imprecise but fairly close to correct | Synonyms: approximately, around, close to, just about, more or less, or so, roughly, some |
| (adverb) in the area or vicinity | Synonyms: around |
| (adverb) in or to a reversed position or direction | Synonyms: around |
| (adverb) in rotation or succession | - |
| (adverb) used of movement to or among many different places or in no particular direction | Synonyms: around |
| (adverb) (of actions or states) slightly short of or not quite accomplished; all but | Synonyms: almost, most, near, nearly, nigh, virtually, well-nigh |
| (adverb) all around or on all sides | Synonyms: around |
| above | (adjective) appearing earlier in the same text | - |
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| (noun) an earlier section of a written text | - |
| (adverb) (in writing) at an earlier place | Synonyms: supra |
| (adverb) in or to a place that is higher | Synonyms: higher up, in a higher place, to a higher place |
| aboveboard | (adjective) without concealment or deception; honest | Synonyms: straightforward |
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| (adverb) in an honest manner | Synonyms: honestly |
| aboveground | (adjective) on or above the surface of the ground | - |
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| adobo | (noun) a dish of marinated vegetables and meat or fish; served with rice | - |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| airborne | (adjective) moved or conveyed by or through air | - |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akimbo | (adjective) (used of arms and legs) bent outward with the joint away from the body | - |
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| (adverb) with hands on hips and elbows extending outward | - |
| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| ambo | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: dais, podium, pulpit, rostrum, soapbox, stump |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| ameboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: amoeboid |
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| amebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amoeban, amoebic, amoebous |
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| ametabolic | (adjective) undergoing slight or no metamorphosis | Synonyms: ametabolous |
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| (adjective) undergoing no (or only slight) metamorphosis | - |
| ametabolous | (adjective) undergoing slight or no metamorphosis | Synonyms: ametabolic |
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| amoeboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: ameboid |
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| amoebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebic |
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| amphibole | (noun) a mineral or mineral variety belonging to the amphibole group | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| anabolic | (adjective) characterized by or promoting constructive metabolism | - |
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| (adjective) of or related to the synthetic phase of metabolism | - |
| anabolism | (noun) the synthesis in living organisms of more complex substances (e.g., living tissue) from simpler ones together with the storage of energy | Synonyms: constructive metabolism |
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| angwantibo | (noun) a kind of yellow or golden lemur (Arctocebus calabarensis) | Synonyms: Arctocebus calabarensis, golden potto |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| antibody | (noun) any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response | - |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| arbor | (noun) a framework that supports climbing plants | Synonyms: arbour, bower, pergola |
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| (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: mandrel, mandril, spindle |
| (noun) tree (as opposed to shrub) | - |
| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arborary | (adjective) of or relating to or formed by trees | Synonyms: arboreal, arborical, arborous |
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| arboreal | (adjective) inhabiting or frequenting trees | Synonyms: arboreous, tree-living |
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| (adjective) of or relating to or formed by trees | Synonyms: arborary, arborical, arborous |
| (adjective) resembling a tree in form and branching structure | Synonyms: arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| arborescent | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboresque | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arborical | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborous |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arboriform | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arborise | (verb) branch out like trees | Synonyms: arborize |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborize | (verb) branch out like trees | Synonyms: arborise |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| arbour | (noun) a framework that supports climbing plants | Synonyms: arbor, bower, pergola |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| baboo | (noun) used as a Hindi courtesy title; equivalent to English `Mr' | Synonyms: babu |
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| baboon | (noun) large terrestrial monkeys having doglike muzzles | - |
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| baboonish | (adjective) resembling a baboon | - |
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| backboard | (noun) a board used to support the back of someone or something | - |
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| (noun) a raised vertical board with basket attached; used to play basketball | Synonyms: basketball backboard |
| backbone | (noun) the part of a network that connects other networks together | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: spine |
| (noun) fortitude and determination | Synonyms: grit, gumption, guts, moxie, sand |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, rachis, spinal column, spine, vertebral column |
| (noun) a central cohesive source of support and stability | Synonyms: anchor, keystone, linchpin, lynchpin, mainstay |
| balboa | (noun) the basic unit of money in Panama; equal to 100 centesimos | - |
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| bamboo | (noun) woody tropical grass having hollow woody stems; mature canes used for construction and furniture | - |
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| (noun) the hard woody stems of bamboo plants; used in construction and crafts and fishing poles | - |
| bamboozle | (verb) conceal one's true motives from especially by elaborately feigning good intentions so as to gain an end | Synonyms: hoodwink, lead by the nose, play false, pull the wool over someone's eyes, snow |
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| bandbox | (noun) a light cylindrical box for holding light articles of attire (especially hats) | - |
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| bankbook | (noun) a record of deposits and withdrawals and interest held by depositors at certain banks | Synonyms: passbook |
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| bareboat | (noun) a vessel (such as a yacht) that can be chartered without a captain or crew or provisions | - |
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| bareboating | (noun) boating by chartering a bareboat and providing your own crew and provisions | - |
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| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| baseborn | (adjective) illegitimate | Synonyms: base |
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| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, humble, lowly |