| 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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| coccoid | (adjective) spherical; like a coccus | - |
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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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| cotyloid | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: acetabular, cotyloidal |
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| crinoid | (adjective) of or relating to or belonging to the class Crinoidea | - |
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| (noun) primitive echinoderms having five or more feathery arms radiating from a central disk | - |
| ctenoid | (adjective) resembling a comb; having projections like the teeth of a comb | Synonyms: comb-like |
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| cuboid | (adjective) shaped like a cube | Synonyms: cube-shaped, cubelike, cubical, cubiform, cuboidal |
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| (noun) a rectangular parallelepiped | - |
| 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 | (adjective) resembling a circle | Synonyms: cycloidal |
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| (noun) a line generated by a point on a circle rolling along a straight line | - |
| 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 | (adjective) of or relating to members of fish family Cyprinidae | Synonyms: cyprinoid |
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| (noun) soft-finned mainly freshwater fishes typically having toothless jaws and cycloid scales | Synonyms: cyprinid fish |
| cyprinoid | (adjective) of or relating to members of fish family Cyprinidae | Synonyms: cyprinid |
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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 | (adjective) triangular or suggesting a capital delta, with a point at the apex | - |
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| (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 |
| demantoid | (noun) a green andradite used as a gemstone | - |
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| dendroid | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroidal, tree-shaped, treelike |
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| desmid | (noun) freshwater green algae | - |
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| devoid | (adjective) completely wanting or lacking | Synonyms: barren, destitute, free, innocent |
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| diapsid | (noun) reptile having a pair of openings in the skull behind each eye | Synonyms: diapsid reptile |
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| dicamptodontid | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodon |
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| dihybrid | (noun) a hybrid produced by parents that differ only at two gene loci that have two alleles each | - |
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| diploid | (adjective) of a cell or organism having two sets of chromosomes or twice the haploid number | - |
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| (noun) (genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number | - |
| discoid | (adjective) having a flat circular shape | Synonyms: disc-shaped, disclike, discoidal, disk-shaped, disklike |
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| ecdysteroid | (noun) #DD: The name 'ecdysteroid' refers to the insect moulting and sex hormones which include ecdysone and its homologues such as 20-hydroxyecdysone. | - |
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| elapid | (noun) any of numerous venomous fanged snakes of warmer parts of both hemispheres | Synonyms: elapid snake |
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| elaterid | (noun) any of various widely distributed beetles | Synonyms: elater, elaterid beetle |
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| ellipsoid | (adjective) having the nature or shape of an ellipsoid | Synonyms: ellipsoidal, spheroidal |
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| (noun) a surface whose plane sections are all ellipses or circles | - |
| energid | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: protoplast |
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| ephemerid | (noun) short-lived insect | Synonyms: ephemeropteran |
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| epicycloid | (noun) a line generated by a point on a circle rolling around another circle | - |
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| epithelioid | (adjective) of or belonging to the epithelium | Synonyms: epithelial |
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| equid | (noun) hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck | Synonyms: equine |
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| erythroid | (adjective) relating to erythrocytes | - |
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| ethmoid | (noun) one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity | Synonyms: ethmoid bone |
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| euglenid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenoid, euglenophyte |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| eurypterid | (noun) large extinct scorpion-like arthropod considered related to horseshoe crabs | - |
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| eyelid | (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: lid, palpebra |
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| factoid | (noun) a brief (usually one sentence and usually trivial) news item | - |
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| (noun) something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print | - |
| felid | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: feline |
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| fervid | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervent |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fiery, impassioned, perfervid, torrid |
| fetid | (adjective) offensively malodorous | Synonyms: foetid, foul-smelling, foul, funky, ill-scented, noisome, smelly, stinking |
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| fibroid | (noun) benign tumor containing fibrous tissue (especially in the uterus) | Synonyms: fibroid tumor |
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| filariid | (adjective) of or relating to or belonging to the family Filariidae | - |
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| flaccid | (adjective) drooping without elasticity; wanting in stiffness | - |
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| (adjective) out of condition; not strong or robust; incapable of exertion or endurance | Synonyms: flabby, soft |
| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| florid | (adjective) elaborately or excessively ornamented | Synonyms: aureate, flamboyant |
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| (adjective) inclined to a healthy reddish color often associated with outdoor life | Synonyms: rubicund, ruddy, sanguine |
| fluid | (adjective) subject to change; variable | Synonyms: unstable |
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| (adjective) in cash or easily convertible to cash | Synonyms: liquid |
| (adjective) smooth and unconstrained in movement | Synonyms: fluent, liquid, smooth |
| (adjective) characteristic of a fluid; capable of flowing and easily changing shape | Synonyms: runny |
| (adjective) affording change (especially in social status) | Synonyms: mobile |
| (noun) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas | - |
| (noun) a substance that is fluid at room temperature and pressure | - |
| foetid | (adjective) offensively malodorous | Synonyms: fetid, foul-smelling, foul, funky, ill-scented, noisome, smelly, stinking |
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| forbid | (verb) command against | Synonyms: disallow, interdict, nix, prohibit, proscribe, veto |
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| (verb) keep from happening or arising; make impossible | Synonyms: foreclose, forestall, preclude, prevent |
| frigid | (adjective) extremely cold | Synonyms: arctic, gelid, glacial, icy, polar |
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| (adjective) devoid of warmth and cordiality; expressive of unfriendliness or disdain | Synonyms: frosty, frozen, glacial, icy, wintry |
| (adjective) sexually unresponsive | Synonyms: cold |
| fucoid | (noun) any of various algae of the family Fucaceae | Synonyms: fucoid algae |
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| (noun) a fossilized cast or impression of algae of the order Fucales | - |
| fulgid | (adjective) having brief brilliant points or flashes of light | Synonyms: aglitter, coruscant, glinting, glistering, glittering, glittery, scintillant, scintillating, sparkly |
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| fungoid | (adjective) resembling fungi | Synonyms: funguslike |
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| gadoid | (noun) a soft-finned fish of the family Gadidae | Synonyms: gadoid fish |
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| ganoid | (noun) primitive fishes having thick bony scales with a shiny covering | Synonyms: ganoid fish |
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| gelechiid | (noun) small slender-winged moths whose larvae are agricultural pests | Synonyms: gelechiid moth |
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| gelid | (adjective) extremely cold | Synonyms: arctic, frigid, glacial, icy, polar |
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| gempylid | (noun) snake mackerels; elongated marine fishes with oily flesh; resembles mackerels; found worldwide | - |
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| geometrid | (noun) slender-bodied broad-winged moth whose larvae are called measuring worms | Synonyms: geometrid moth |
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| glochid | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochidium |
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| glucocorticoid | (noun) a steroid hormone that is produced by the adrenal cortex of animals; affects functioning of gonads and has anti-inflammatory activity | - |
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| gracilariid | (noun) small dull or metallic-colored tineoid moths whose larvae mine in plant leaves | Synonyms: gracilariid moth |
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| gravid | (adjective) in an advanced stage of pregnancy | Synonyms: big, enceinte, expectant, great, heavy, large, with child |
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| grid | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: gridiron |
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| (noun) an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube | Synonyms: control grid |
| (noun) a system of high tension cables by which electrical power is distributed throughout a region | Synonyms: power grid, power system |
| (noun) a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material | Synonyms: storage-battery grid |
| (noun) a pattern of regularly spaced horizontal and vertical lines | - |
| haemoproteid | (noun) related to malaria parasite and having a phase in the viscera of various birds | - |
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| haemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: hemorrhoid, piles |
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| handmaid | (noun) a personal maid or female attendant | Synonyms: handmaiden |
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| (noun) in a subordinate position | Synonyms: handmaiden, servant |
| haploid | (adjective) of a cell or organism having a single set of chromosomes | Synonyms: haploidic, monoploid |
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| (noun) (genetics) an organism or cell having only one complete set of chromosomes | - |
| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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| hemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: haemorrhoid, piles |
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| heteroploid | (noun) (genetics) an organism or cell having a chromosome number that is not an even multiple of the haploid chromosome number for that species | - |
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| hippoboscid | (noun) bloodsucking dipterous fly parasitic on birds and mammals | Synonyms: louse fly |
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| hispid | (adjective) (of animals or plants) having stiff coarse hairs or bristles | - |
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| hominid | (adjective) characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures | Synonyms: hominian |
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| (noun) a primate of the family Hominidae | - |
| hominoid | (noun) a primate of the superfamily Hominoidea | - |
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| horrid | (adjective) exceedingly bad | - |
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| (adjective) grossly offensive to decency or morality; causing horror | Synonyms: hideous, horrific, outrageous |
| housemaid | (noun) a female domestic | Synonyms: amah, maid, maidservant |
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| humanoid | (noun) an automaton that resembles a human being | Synonyms: android, mechanical man |
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| humid | (adjective) containing or characterized by a great deal of water vapor | - |
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| hyaloid | (adjective) resembling glass in transparency or translucency | Synonyms: hyaline |
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| (noun) the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina | Synonyms: hyaloid membrane |