| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| andrenid | (noun) a bee that is a member of the genus Andrena | Synonyms: andrena, mining bee |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| canid | (noun) any of various fissiped mammals with nonretractile claws and typically long muzzles | Synonyms: canine |
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| clinid | (noun) mostly small blennioid fishes of coral reefs and seagrass beds | Synonyms: clinid fish |
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| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| cnidarian | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: coelenterate |
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| conidiophore | (noun) a specialized fungal hypha that produces conidia | - |
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| conidiospore | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidium |
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| conidium | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidiospore |
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| ctenidium | (noun) comb-like respiratory structure serving as the gill of certain mollusks | - |
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| cyanide | (noun) an extremely poisonous salt of hydrocyanic acid | - |
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| (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: nitril, nitrile |
| 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 |
| encainide | (noun) antiarrhythmic drug (trade name Enkaid) used to treat life-threatening arrhythmias but increases the risk of sudden death in heart attack patients | Synonyms: Enkaid |
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| euglenid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenoid, euglenophyte |
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| ferricyanide | (noun) salt of ferricyanic acid obtained by oxidation of a ferrocyanide | - |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| flecainide | (noun) oral antiarrhythmic medication (trade name Tambocor) used as a last resort in treating arrhythmias; increases the risk of sudden death in heart attack patients | Synonyms: Tambocor |
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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 | - |
| hyaluronidase | (noun) an enzyme (trade name Hyazyme) that splits hyaluronic acid and so lowers its viscosity and increases the permeability of connective tissue and the absorption of fluids | Synonyms: Hyazyme, spreading factor |
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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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| lanthanide | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanoid, lanthanon, rare-earth element, rare earth |
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| lycaenid | (noun) any of various butterflies of the family Lycaenidae | Synonyms: lycaenid butterfly |
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| methylphenidate | (noun) central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children | Synonyms: Ritalin |
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| metronidazole | (noun) antiprotozoal medication (trade name Flagyl) used to treat trichomoniasis and giardiasis | Synonyms: Flagyl |
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| nidation | (noun) (embryology) the organic process whereby a fertilized egg becomes implanted in the lining of the uterus of placental mammals | Synonyms: implantation |
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| nidicolous | (adjective) (of birds) remaining in the nest for a time after hatching | - |
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| nidifugous | (adjective) (of birds) leaving the nest shortly after hatching | - |
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| nidus | (noun) a nest in which spiders or insects deposit their eggs | - |
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| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, focus |
| nonidentity | (noun) Difference, distinction; failure to be identical. | - |
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| omnidirectional | (adjective) not directional | - |
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| ozonide | (noun) any of a class of unstable chemical compounds resulting from the addition of ozone to a double bond in an unsaturated compound | - |
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| phasianid | (noun) a kind of game bird in the family Phasianidae | - |
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| phoronid | (noun) hermaphrodite wormlike animal living in mud of the sea bottom | - |
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| procyonid | (noun) plantigrade carnivorous mammals | - |
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| pycnidium | (noun) flask-shaped asexual structure containing conidia | - |
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| pycnogonid | (noun) any of various small spiderlike marine arthropods having small thin bodies and long slender legs | Synonyms: sea spider |
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| quinidine | (noun) cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias | Synonyms: Quinidex, Quinora |
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| ranid | (noun) insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs | Synonyms: true frog |
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| salmonid | (noun) soft-finned fishes of cold and temperate waters | - |
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| sciaenid | (noun) widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound | Synonyms: sciaenid fish |
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| scorpaenid | (noun) any of numerous carnivorous usually bottom-dwelling warm-water marine fishes found worldwide but most abundant in the Pacific | Synonyms: scorpaenid fish |
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| serranid | (noun) marine food sport fishes mainly of warm coastal waters | Synonyms: serranid fish |
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| snide | (adjective) expressive of contempt | Synonyms: sneering, supercilious |
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| snidely | (adverb) with a sneer; in an uncomplimentary sneering manner | Synonyms: sneeringly, superciliously |
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| tenebrionid | (noun) sluggish hard-bodied black terrestrial weevil whose larvae feed on e.g. decaying plant material or grain | Synonyms: darkling beetle, darkling groung beetle |
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| teredinid | (noun) wormlike marine bivalve that bores into wooden piers and ships by means of drill-like shells | Synonyms: shipworm |
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| tocainide | (noun) antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed | Synonyms: Tonocard |
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| transactinide | (adjective) of or belonging to the elements with atomic numbers greater than 103 | - |
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| (noun) any of the artificially produced elements with atomic numbers greater than 103 | - |
| tyrannid | (noun) a passerine bird of the suborder Tyranni | - |
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| unidentifiable | (adjective) impossible to identify | - |
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| unidentified | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unknown, unnamed |
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| (adjective) not yet identified | - |
| unidimensional | (adjective) relating to a single dimension or aspect; having no depth or scope | Synonyms: one-dimensional |
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| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |
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| vespertilionid | (noun) a variety of carnivorous bat | Synonyms: vespertilian bat |
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