| 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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| bicuspid | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspidate |
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| (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| chrysopid | (noun) pale green unpleasant-smelling lacewing fly having carnivorous larvae | Synonyms: green lacewing, stink fly |
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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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| elapid | (noun) any of numerous venomous fanged snakes of warmer parts of both hemispheres | Synonyms: elapid snake |
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| hispid | (adjective) (of animals or plants) having stiff coarse hairs or bristles | - |
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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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| lasiocampid | (noun) medium-sized stout-bodied neutral-colored moths with comb-like antennae | Synonyms: lasiocampid moth |
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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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| mantispid | (noun) insect that resembles a mantis; larvae are parasites in the nests of spiders and wasps | - |
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| phospholipid | (noun) any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes | - |
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| rapid | (adjective) done or occurring in a brief period of time | - |
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| (adjective) characterized by speed; moving with or capable of moving with high speed | Synonyms: speedy |
| (noun) a part of a river where the current is very fast | - |
| sapid | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavourous, flavoursome, saporous |
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| stupid | (adjective) lacking or marked by lack of intellectual acuity | - |
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| (adjective) lacking intelligence | Synonyms: unintelligent |
| (adjective) in a state of mental numbness especially as resulting from shock | Synonyms: dazed, stunned, stupefied |
| (noun) a person who is not very bright | Synonyms: dolt, dullard, pillock, poor fish, pudden-head, pudding head, stupe, stupid person |
| tepid | (adjective) feeling or showing little interest or enthusiasm | Synonyms: half-hearted, halfhearted, lukewarm |
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| (adjective) moderately warm | Synonyms: lukewarm |
| thripid | (noun) any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive | Synonyms: thrip, thrips |
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| torpid | (adjective) in a condition of biological rest or suspended animation | Synonyms: dormant, hibernating |
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| (adjective) slow and apathetic | Synonyms: inert, sluggish, soggy |
| trepid | (adjective) timid by nature or revealing timidity | Synonyms: fearful, timorous |
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| tricuspid | (adjective) having three cusps or points (especially a molar tooth) | Synonyms: tricuspidate |
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| unicuspid | (adjective) having a single cusp or point | - |
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| vapid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, insipid, savorless, savourless |
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| (adjective) lacking significance or liveliness or spirit or zest | - |
| vespid | (noun) mostly social nest-building wasps | Synonyms: vespid wasp |
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