| hybrid | (adjective) produced by crossbreeding | Synonyms: intercrossed |
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| (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, crossbreed |
| (noun) a car which runs on two power sources, usually an internal combustion engine and an electronic motor | Synonyms: hybrid car |
| (noun) a composite of mixed origin | - |
| (noun) a word that is composed of parts from different languages (e.g., `monolingual' has a Greek prefix and a Latin root) | Synonyms: loan-blend, loanblend |
| hydatid | (noun) cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) | - |
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| hydrocolloid | (noun) a substance that forms a gel with water | - |
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| hydroid | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydrozoan |
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| hyoid | (adjective) of or relating to the hyoid bone | - |
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| (noun) a U-shaped bone at the base of the tongue that supports the tongue muscles | Synonyms: hyoid bone, os hyoideum |
| hyperboloid | (noun) a quadric surface generated by rotating a hyperbola around its main axis | - |
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| hypnoid | (adjective) of or relating to a state of sleep or hypnosis | - |
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| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
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| id | (noun) (psychoanalysis) primitive instincts and energies underlying all psychic activity | - |
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| iguanid | (noun) lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males | Synonyms: iguanid lizard |
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| inlaid | (adjective) adorned by inlays | - |
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| insipid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, savorless, savourless, vapid |
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| (adjective) lacking interest or significance or impact | Synonyms: jejune |
| intrepid | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, unfearing |
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| invalid | (adjective) having no cogency or legal force | - |
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| (adjective) no longer valid | - |
| (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
| (verb) injure permanently | Synonyms: disable, handicap, incapacitate |
| (verb) force to retire, remove from active duty, as of firemen | - |
| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
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| isoniazid | (noun) antibacterial drug (trade name Nydrazid) used to treat tuberculosis | Synonyms: INH, Nydrazid |
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| ixodid | (noun) ticks having a hard shield on the back and mouth parts that project from the head | Synonyms: hard tick |
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| jassid | (noun) a variety of leafhopper | - |
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| katydid | (noun) large green long-horned grasshopper of North America; males produce shrill sounds by rubbing together special organs on the forewings | - |
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| keloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: cheloid |
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| ketosteroid | (noun) a steroid containing a ketone group | - |
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| kid | (noun) young goat | - |
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| (noun) a young person of either sex | Synonyms: child, fry, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster |
| (noun) a human offspring (son or daughter) of any age | Synonyms: child |
| (noun) soft smooth leather from the hide of a young goat | Synonyms: kidskin |
| (verb) be silly or tease one another | Synonyms: banter, chaff, jolly, josh |
| (verb) tell false information to for fun | Synonyms: pull the leg of |
| lacertid | (noun) Old World terrestrial lizard | Synonyms: lacertid lizard |
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| laid | (adjective) set down according to a plan | Synonyms: set |
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| languid | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languorous |
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| lanthanoid | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanide, lanthanon, rare-earth element, rare earth |
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| larid | (noun) long-winged web-footed aquatic bird of the gull family | - |
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| lasiocampid | (noun) medium-sized stout-bodied neutral-colored moths with comb-like antennae | Synonyms: lasiocampid moth |
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| leporid | (noun) rabbits and hares | Synonyms: leporid mammal |
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| leptodactylid | (noun) toothed frogs: terrestrial or aquatic or arboreal | Synonyms: leptodactylid frog |
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| lid | (noun) a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc. | - |
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| (noun) headdress that protects the head from bad weather; has shaped crown and usually a brim | Synonyms: chapeau, hat |
| (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: eyelid, palpebra |
| liliopsid | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, monocot, monocotyledon |
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| limacoid | (adjective) of or resembling a slug | Synonyms: limacine |
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| limpid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, lucid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, lucid, pellucid, transparent |
| (adjective) clear and bright | Synonyms: liquid |
| lipid | (noun) an oily organic compound insoluble in water but soluble in organic solvents; essential structural component of living cells (along with proteins and carbohydrates) | Synonyms: lipide, lipoid |
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| lipoid | (noun) an oily organic compound insoluble in water but soluble in organic solvents; essential structural component of living cells (along with proteins and carbohydrates) | Synonyms: lipid, lipide |
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| liquid | (adjective) existing as or having characteristics of a liquid; especially tending to flow | - |
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| (adjective) changed from a solid to a liquid state | Synonyms: liquified, melted |
| (adjective) clear and bright | Synonyms: limpid |
| (adjective) in cash or easily convertible to cash | Synonyms: fluid |
| (adjective) smooth and unconstrained in movement | Synonyms: fluent, fluid, smooth |
| (adjective) smooth and flowing in quality; entirely free of harshness | - |
| (adjective) filled or brimming with tears | Synonyms: swimming |
| (noun) a frictionless continuant that is not a nasal consonant (especially `l' and `r') | - |
| (noun) the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility | Synonyms: liquid state, liquidity, liquidness |
| (noun) fluid matter having no fixed shape but a fixed volume | - |
| (noun) a substance that is liquid at room temperature and pressure | - |
| livid | (adjective) furiously angry | - |
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| (adjective) anemic looking from illness or emotion | Synonyms: ashen, blanched, bloodless, white |
| (adjective) discolored by coagulation of blood beneath the skin | Synonyms: black-and-blue |
| (adjective) (of a light) imparting a deathlike luminosity | - |
| lucid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, limpid, pellucid, transparent |
| (adjective) capable of thinking and expressing yourself in a clear and consistent manner | Synonyms: coherent, logical |
| (adjective) having a clear mind | - |
| lurid | (adjective) shining with an unnatural red glow as of fire seen through smoke | - |
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| (adjective) ghastly pale | - |
| (adjective) glaringly vivid and graphic; marked by sensationalism | Synonyms: shocking |
| (adjective) horrible in fierceness or savagery | - |
| lycaenid | (noun) any of various butterflies of the family Lycaenidae | Synonyms: lycaenid butterfly |
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| lygaeid | (noun) a true bug: usually bright-colored; pest of cultivated crops and some fruit trees | Synonyms: lygaeid bug |
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| lymantriid | (noun) dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees | Synonyms: tussock moth |
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| lymphoid | (adjective) resembling lymph or lymphatic tissues | - |
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| machilid | (noun) wingless insect living in dark moist places as under dead tree trunks; they make erratic leaps when disturbed | Synonyms: jumping bristletail |
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| magnoliopsid | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, exogen |
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| maid | (noun) an unmarried girl (especially a virgin) | Synonyms: maiden |
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| (noun) a female domestic | Synonyms: amah, housemaid, maidservant |
| mantid | (noun) predacious long-bodied large-eyed insect of warm regions; rests with forelimbs raised as in prayer | Synonyms: mantis |
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| mantispid | (noun) insect that resembles a mantis; larvae are parasites in the nests of spiders and wasps | - |
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| masjid | (noun) (Islam) a Muslim place of worship | Synonyms: musjid |
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| mastoid | (adjective) relating to or resembling a nipple | Synonyms: mastoidal |
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| (adjective) of or relating to or in the region of the mastoid process | - |
| (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid bone, mastoid process, mastoidal |
| medusoid | (adjective) relating to or resembling a medusa | - |
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| (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusan |
| megatheriid | (noun) a large extinct ground sloth | Synonyms: megatherian, megatherian mammal |
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| meloid | (noun) beetle that produces a secretion that blisters the skin | Synonyms: blister beetle |
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| mermaid | (noun) half woman and half fish; lives in the sea | - |
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| metalloid | (adjective) of or being a nonmetallic element that has some of the properties of metal | - |
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| meteoroid | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteor |
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| micrometeoroid | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeorite |
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| mid | (adjective) used in combination to denote the middle | - |
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| milkmaid | (noun) a woman who works in a dairy | Synonyms: dairymaid |
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| mineralocorticoid | (noun) hormone that is one of the steroids of the adrenal cortex that influences the metabolism of sodium and potassium | - |
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| mirid | (noun) a variety of leaf bug | Synonyms: capsid, mirid bug |
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| mislaid | (adjective) lost temporarily; as especially put in an unaccustomed or forgotten place | Synonyms: misplaced |
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| mongoloid | (adjective) (offensive) of or relating to or suffering from Down syndrome | - |
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| (adjective) characteristic of or resembling a Mongol | - |
| (noun) a person suffering from Down syndrome (no longer used technically in this sense, now considered offensive) | - |
| monohybrid | (noun) a hybrid produced by crossing parents that are homozygous except for a single gene locus that has two alleles (as in Mendel's experiments with garden peas) | - |
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| monoploid | (adjective) of a cell or organism having a single set of chromosomes | Synonyms: haploid, haploidic |
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| morbid | (adjective) suggesting the horror of death and decay | Synonyms: ghoulish |
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| (adjective) caused by or altered by or manifesting disease or pathology | Synonyms: diseased, pathologic, pathological |
| (adjective) suggesting an unhealthy mental state | - |
| mucinoid | (adjective) resembling mucin | - |
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| mucoid | (adjective) relating to or resembling mucus | Synonyms: mucoidal |
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| (noun) any of several glycoproteins similar to mucin | - |
| mujahid | (noun) a Muslim engaged in what he considers to be a jihad | - |
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| musjid | (noun) (Islam) a Muslim place of worship | Synonyms: masjid |
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| mustelid | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: musteline, musteline mammal |
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| myeloid | (adjective) of or relating to bone marrow | - |
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| (adjective) of or relating to bone marrow cells | Synonyms: myelic |
| (adjective) marrowlike | - |
| mylodontid | (noun) a variety of extinct edentate | - |
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| myoid | (adjective) resembling muscle | - |
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| mytilid | (noun) marine bivalve mollusk having a dark elongated shell; live attached to solid objects especially in intertidal zones | Synonyms: marine mussel |
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| neritid | (noun) operculate seasnail of coastal waters with a short spiral shell | Synonyms: neritid gastropod |
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| nitid | (adjective) bright with a steady but subdued shining | Synonyms: agleam, gleaming |
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| noctuid | (noun) usually dull-colored medium-sized nocturnal moth; the usually smooth-bodied larvae are destructive agricultural pests | Synonyms: noctuid moth, owlet moth |
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| nonrigid | (adjective) designating an airship having a shape maintained only by internal gas pressure and without a supporting structure | - |
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| nonskid | (adjective) designed to reduce or prevent skidding | - |
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| nonsteroid | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroidal |
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| nonviscid | (adjective) not resembling glue in texture | Synonyms: nonglutinous |
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| nursemaid | (noun) a woman who is the custodian of children | Synonyms: nanny, nurse |
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| nymphalid | (noun) medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast | Synonyms: brush-footed butterfly, four-footed butterfly, nymphalid butterfly |
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| ootid | (noun) mature ovum after penetration by sperm but before the formation of a zygote | - |
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| orchid | (noun) any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors | Synonyms: orchidaceous plant |
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| ornithomimid | (noun) lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes | - |
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| outbid | (verb) bid higher than others | - |
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| (verb) bid over an opponent's bid when one's partner has not bid or doubled | - |
| overbid | (noun) a bid that is higher than preceding bids | - |
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| (noun) (bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand) | Synonyms: overcall |
| (verb) bid more than the object is worth | - |
| (verb) to bid for more tricks than one can expect to win | - |
| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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| ovoid | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, ovate, oviform, prolate |
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| (noun) an egg-shaped object | - |
| oxyacid | (noun) any acid that contains oxygen | Synonyms: oxygen acid |
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| paid | (adjective) marked by the reception of pay | - |
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| (adjective) involving gainful employment in something often done as a hobby | Synonyms: nonrecreational |
| (adjective) yielding a fair profit | Synonyms: gainful, paying |
| pallid | (adjective) abnormally deficient in color as suggesting physical or emotional distress | Synonyms: pale, wan |
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| (adjective) lacking in vitality or interest or effectiveness | Synonyms: pale |
| (adjective) (of light) lacking in intensity or brightness; dim or feeble | Synonyms: pale, sick, wan |
| palmatifid | (adjective) of a leaf shape; palmately cleft rather than lobed | - |
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| paraboloid | (noun) a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis | - |
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| paranoid | (adjective) suffering from paranoia | - |
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| (noun) a person afflicted with paranoia | Synonyms: paranoiac |
| parathyroid | (noun) any one of four endocrine glands situated above or within the thyroid gland | Synonyms: parathyroid gland |
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| paratyphoid | (noun) any of a variety of infectious intestinal diseases resembling typhoid fever | Synonyms: paratyphoid fever |
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