| acarid | (noun) very small free-living arachnid that is parasitic on animals or plants; related to ticks | - |
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| acrid | (adjective) strong and sharp | Synonyms: pungent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| arid | (adjective) lacking sufficient water or rainfall | Synonyms: waterless |
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| (adjective) lacking vitality or spirit; lifeless | Synonyms: desiccate, desiccated |
| bedrid | (adjective) confined to bed (by illness) | Synonyms: bedfast, bedridden, sick-abed |
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| clerid | (noun) predacious on other insects; usually brightly colored or metallic | Synonyms: clerid beetle |
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| colubrid | (noun) mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes | Synonyms: colubrid snake |
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| dasyurid | (noun) small carnivorous nocturnal marsupials of Australia and Tasmania | Synonyms: dasyurid marsupial |
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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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| elaterid | (noun) any of various widely distributed beetles | Synonyms: elater, elaterid beetle |
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| ephemerid | (noun) short-lived insect | Synonyms: ephemeropteran |
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| eurypterid | (noun) large extinct scorpion-like arthropod considered related to horseshoe crabs | - |
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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 |
| geometrid | (noun) slender-bodied broad-winged moth whose larvae are called measuring worms | Synonyms: geometrid moth |
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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 | - |
| horrid | (adjective) exceedingly bad | - |
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| (adjective) grossly offensive to decency or morality; causing horror | Synonyms: hideous, horrific, outrageous |
| 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 |
| larid | (noun) long-winged web-footed aquatic bird of the gull family | - |
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| leporid | (noun) rabbits and hares | Synonyms: leporid mammal |
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| 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 | - |
| mirid | (noun) a variety of leaf bug | Synonyms: capsid, mirid bug |
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| 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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| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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| pierid | (noun) any of numerous pale-colored butterflies having three pairs of well-developed legs | Synonyms: pierid butterfly |
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| putrid | (adjective) of or relating to or attended by putrefaction | - |
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| (adjective) morally corrupt or evil | - |
| (adjective) in an advanced state of decomposition and having a foul odor | - |
| rid | (verb) relieve from | Synonyms: disembarrass, free |
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| sciarid | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciara |
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| semiarid | (adjective) somewhat arid | - |
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| silurid | (noun) Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin | Synonyms: silurid fish |
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| sparid | (noun) spiny-finned food fishes of warm waters having well-developed teeth | Synonyms: sparid fish |
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| torrid | (adjective) extremely hot and dry | - |
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| (adjective) emotionally charged and vigorously energetic | - |
| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, impassioned, perfervid |