| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| acridid | (noun) grasshopper with short antennae | Synonyms: short-horned grasshopper |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| 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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| aridity | (noun) the quality of yielding nothing of value | Synonyms: barrenness, fruitlessness |
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| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridness, thirstiness |
| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| enchiridion | (noun) a concise reference book providing specific information about a subject or location | Synonyms: handbook, vade mecum |
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| floridity | (noun) extravagant elaborateness | Synonyms: flamboyance, floridness, showiness |
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| floxuridine | (noun) antineoplastic drug used to treat some cancers; can cause loss of hair | - |
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| fluoridisation | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridization |
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| fluoridization | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridisation |
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| gridiron | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: grid |
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| (noun) the playing field on which football is played | Synonyms: football field |
| haemosporidian | (noun) minute protozoans parasitic at some stage of the life cycle in blood cells of vertebrates including many pathogens | - |
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| haplosporidian | (noun) parasite in invertebrates and lower vertebrates of no known economic importance | - |
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| hybridisation | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridization, hybridizing, interbreeding |
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| hybridization | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridisation, hybridizing, interbreeding |
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| hybridizing | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridisation, hybridization, interbreeding |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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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 |
| microsporidian | (noun) parasite of arthropods and fishes that invade and destroy host cells | - |
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| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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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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| phenazopyridine | (noun) analgesic (trade name Pyridium) used to treat urinary tract infections | Synonyms: Pyridium |
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| putridity | (noun) the state of being putrid | - |
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| pyridine | (noun) a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal | - |
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| rhinosporidiosis | (noun) fungal infection of the nose; often acquired while swimming | - |
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| ridicule | (noun) the act of deriding or treating with contempt | Synonyms: derision |
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| (noun) language or behavior intended to mock or humiliate | - |
| ridiculer | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ironist, satirist |
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| ridiculousness | (noun) a message whose content is at variance with reason | Synonyms: absurdity, absurdness |
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| riding | (noun) travel by being carried on horseback | Synonyms: horseback riding |
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| (noun) the sport of sitting on the back of a horse while controlling its movements | Synonyms: equitation, horseback riding |
| sarcosporidian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcocystieian |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| surfriding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfing |
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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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| torridity | (noun) extreme heat | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| viridity | (noun) green color or pigment; resembling the color of growing grass | Synonyms: green, greenness |
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