| aerides | (noun) any orchid of the genus Aerides | - |
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| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| clerid | (noun) predacious on other insects; usually brightly colored or metallic | Synonyms: clerid beetle |
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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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| glyceride | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: acylglycerol |
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| gueridon | (noun) a small round table | - |
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| haloperidol | (noun) tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome | Synonyms: Haldol |
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| hyperidrosis | (noun) excessive and profuse perspiration | Synonyms: hyperhidrosis, polyhidrosis |
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| meperidine | (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain | Synonyms: Demerol, meperidine hydrochloride |
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| meridian | (noun) an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator | Synonyms: line of longitude |
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| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, peak, pinnacle, summit, superlative, tiptop, top |
| pepperidge | (noun) columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall | Synonyms: black gum, Nyssa sylvatica, sour gum |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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| peridium | (noun) outer layer of the spore-bearing organ in many fungi | - |
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| peridot | (noun) a pale green variety of chrysolite; used as a gemstone | - |
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| peridotite | (noun) a dark coarse-grained igneous rock consisting principally of olivine | - |
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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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| pteridologist | (noun) an expert in the study of ferns | - |
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| pteridology | (noun) the branch of botany that studies ferns | - |
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| pteridophyte | (noun) plants having vascular tissue and reproducing by spores | Synonyms: nonflowering plant |
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| pteridosperm | (noun) an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) | Synonyms: seed fern |
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| theridiid | (noun) spider having a comb-like row of bristles on each hind foot | Synonyms: comb-footed spider |
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| triglyceride | (noun) glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body | - |
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