| acarid | (noun) very small free-living arachnid that is parasitic on animals or plants; related to ticks | - |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acid | (noun) street name for lysergic acid diethylamide | Synonyms: back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen |
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| (noun) any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt | - |
| acridid | (noun) grasshopper with short antennae | Synonyms: short-horned grasshopper |
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| actinoid | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
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| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| adenoid | (noun) a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx) | Synonyms: Luschka's tonsil, pharyngeal tonsil, third tonsil, tonsilla adenoidea, tonsilla pharyngealis |
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| agamid | (noun) a lizard of the family Agamidae | Synonyms: agamid lizard |
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| aid | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: assist, assistance, help |
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| (noun) the work of providing treatment for or attending to someone or something | Synonyms: attention, care, tending |
| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: assistance, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: assistance, economic aid, economic assistance, financial aid, financial assistance |
| albuminoid | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: scleroprotein |
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| alkaloid | (noun) natural bases containing nitrogen found in plants | - |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| ammonoid | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonite |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amygdaloid | (noun) volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits | - |
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| amyloid | (noun) (pathology) a waxy translucent complex protein resembling starch that results from degeneration of tissue | - |
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| (noun) a non-nitrogenous food substance consisting chiefly of starch; any substance resembling starch | - |
| anapsid | (noun) primitive reptile having no opening in the temporal region of the skull; all extinct except turtles | Synonyms: anapsid reptile |
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| anaspid | (noun) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian | - |
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| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
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| android | (noun) an automaton that resembles a human being | Synonyms: humanoid, mechanical man |
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| (noun) An operating system from Google for mobile devices | - |
| aneroid | (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
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| annelid | (noun) worms with cylindrical bodies segmented both internally and externally | Synonyms: annelid worm, segmented worm |
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| antacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antiacid, gastric antacid |
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| antherozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: spermatozoid |
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| anthropoid | (noun) any member of the suborder Anthropoidea including monkeys and apes and hominids | - |
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| (noun) person who resembles a nonhuman primate | Synonyms: ape |
| antiacid | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, alkalizer, antacid, gastric antacid |
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| apartheid | (noun) a social policy or racial segregation involving political and economic and legal discrimination against people who are not Whites; the former official policy in South Africa | - |
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| aphid | (noun) any of various small plant-sucking insects | - |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| arachnoid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
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| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| arctiid | (noun) stout-bodied broad-winged moth with conspicuously striped or spotted wings; larvae are hairy caterpillars | Synonyms: arctiid moth |
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| argasid | (noun) tick lacking a dorsal shield and having mouth parts on the under side of the head | Synonyms: soft tick |
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| aroid | (noun) any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe | Synonyms: arum |
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| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| arytenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytaenoid, arytenoid cartilage |
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| asteroid | (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| bacteroid | (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
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| barmaid | (noun) a female bartender | - |
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| bicuspid | (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
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| bid | (noun) an attempt to get something | Synonyms: play |
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| (noun) a formal proposal to buy at a specified price | Synonyms: tender |
| (noun) (bridge) the number of tricks a bridge player is willing to contract to make | Synonyms: bidding |
| (noun) an authoritative direction or instruction to do something | Synonyms: bidding, command, dictation |
| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| blennioid | (noun) elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins | Synonyms: blennioid fish |
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| bombycid | (noun) moderate-sized Asiatic moth whose larvae feed on mulberry leaves and produce silk | Synonyms: bombycid moth, silkworm moth |
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| bondmaid | (noun) a female slave | Synonyms: bondswoman, bondwoman |
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| (noun) a female bound to serve without wages | Synonyms: bondswoman, bondwoman |
| bovid | (noun) hollow-horned ruminants | - |
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| braid | (noun) trimming used to decorate clothes or curtains | Synonyms: braiding, gold braid |
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| (noun) a hairdo formed by braiding or twisting the hair | Synonyms: plait, tress, twist |
| bridesmaid | (noun) an unmarried woman who attends the bride at a wedding | Synonyms: maid of honor |
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| cancroid | (noun) the most common form of skin cancer | Synonyms: squamous cell carcinoma |
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| canid | (noun) any of various fissiped mammals with nonretractile claws and typically long muzzles | Synonyms: canine |
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| caprimulgid | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: goatsucker, nightjar |
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| capsid | (noun) the outer covering of protein surrounding the nucleic acid of a virus | - |
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| (noun) a variety of leaf bug | Synonyms: mirid, mirid bug |
| carangid | (noun) a percoid fish of the family Carangidae | Synonyms: carangid fish |
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| carcinoid | (noun) a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin | - |
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| cardioid | (noun) an epicycloid in which the rolling circle equals the fixed circle | - |
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| carotenoid | (noun) any of a class of highly unsaturated yellow to red pigments occurring in plants and animals | - |
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| caryatid | (noun) a supporting column carved in the shape of a person | - |
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| cathartid | (noun) large birds of prey superficially similar to Old World vultures | Synonyms: New World vulture |
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| catostomid | (noun) a cypriniform fish of the family Catostomidae | - |
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| celluloid | (noun) a medium that disseminates moving pictures | Synonyms: cinema, film |
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| (noun) highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics | - |
| centrarchid | (noun) small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies, black bass, bluegills, pumpkinseed | Synonyms: sunfish |
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| centroid | (noun) the center of mass of an object of uniform density | - |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| cervid | (noun) distinguished from Bovidae by the male's having solid deciduous antlers | Synonyms: deer |
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| chalcid | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid fly, chalcid wasp, chalcidfly |
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| chambermaid | (noun) a maid who is employed to clean and care for bedrooms (now primarily in hotels) | Synonyms: fille de chambre |
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| chancroid | (noun) infectious venereal ulcer | - |
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| characid | (noun) any freshwater fish of the family Characinidae | Synonyms: characin, characin fish |
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| cheloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: keloid |
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| choroid | (noun) a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye | Synonyms: choroid coat |
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| chromatid | (noun) one of two identical strands into which a chromosome splits during mitosis | - |
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| chrysomelid | (noun) brightly colored beetle that feeds on plant leaves; larvae infest roots and stems | Synonyms: leaf beetle |
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| chrysopid | (noun) pale green unpleasant-smelling lacewing fly having carnivorous larvae | Synonyms: green lacewing, stink fly |
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| cichlid | (noun) freshwater fishes of tropical America and Africa and Asia similar to American sunfishes; some are food fishes; many small ones are popular in aquariums | Synonyms: cichlid fish |
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| clerid | (noun) predacious on other insects; usually brightly colored or metallic | Synonyms: clerid beetle |
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| clinid | (noun) mostly small blennioid fishes of coral reefs and seagrass beds | Synonyms: clinid fish |
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| clupeid | (noun) any of numerous soft-finned schooling food fishes of shallow waters of northern seas | Synonyms: clupeid fish |
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| colloid | (noun) a mixture with properties between those of a solution and fine suspension | - |
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| colubrid | (noun) mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes | Synonyms: colubrid snake |
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| comatulid | (noun) free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms | Synonyms: feather star |
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| conchoid | (noun) Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts). | - |
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| conoid | (noun) a shape whose base is a circle and whose sides taper up to a point | Synonyms: cone, cone shape |
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| coreid | (noun) a true bug | Synonyms: coreid bug |
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| corticoid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticosteroid |
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| corticosteroid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticoid |
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| cosmid | (noun) (genetics) a large vector that is made from a bacteriophage and used to clone genes or gene fragments | - |
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| crinoid | (noun) primitive echinoderms having five or more feathery arms radiating from a central disk | - |
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| cuboid | (noun) a rectangular parallelepiped | - |
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| cupid | (noun) a symbol for love in the form of a cherubic naked boy with wings and a bow and arrow | - |
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| cuspid | (noun) one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars | Synonyms: canine, canine tooth, dogtooth, eye tooth, eyetooth |
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| cyanamid | (noun) a weak soluble dibasic acid (the parent acid of cyanamide salts) | Synonyms: cyanamide |
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| cycloid | (noun) a line generated by a point on a circle rolling along a straight line | - |
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| cymbid | (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers | Synonyms: cymbidium |
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| cyprinid | (noun) soft-finned mainly freshwater fishes typically having toothless jaws and cycloid scales | Synonyms: cyprinid fish |
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| dairymaid | (noun) a woman who works in a dairy | Synonyms: milkmaid |
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| danaid | (noun) large tropical butterfly with degenerate forelegs and an unpleasant taste | Synonyms: danaid butterfly |
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| dasyurid | (noun) small carnivorous nocturnal marsupials of Australia and Tasmania | Synonyms: dasyurid marsupial |
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| deltoid | (noun) a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm | Synonyms: deltoid muscle, musculus deltoideus |
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