| acetyl | (noun) the organic group of acetic acid (CH3CO-) | Synonyms: acetyl group, acetyl radical, ethanoyl group, ethanoyl radical |
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| acyl | (noun) any group or radical of the form RCO- where R is an organic group | Synonyms: acyl group |
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| alkyl | (noun) any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons | Synonyms: alkyl group, alkyl radical |
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| allyl | (noun) the univalent unsaturated organic radical C3H5; derived from propylene | Synonyms: allyl group, allyl radical |
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| amyl | (noun) a hydrocarbon radical that occurs in many organic compounds | - |
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| anesthyl | (noun) a mixture of methyl and ethyl chloride; sprayed on as a local anesthetic | - |
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| artiodactyl | (noun) placental mammal having hooves with an even number of functional toes on each foot | Synonyms: artiodactyl mammal, even-toed ungulate |
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| benzyl | (noun) the univalent radical derived from toluene | Synonyms: benzyl group, benzyl radical |
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| beryl | (noun) the chief source of beryllium; colored transparent varieties are valued as gems | - |
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| butyl | (noun) a hydrocarbon radical (C4H9) | - |
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| cacodyl | (noun) the univalent group derived from arsine | Synonyms: arsenic group, cacodyl group, cacodyl radical |
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| (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: tetramethyldiarsine |
| carbonyl | (noun) a compound containing metal combined with carbon monoxide | - |
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| carboxyl | (noun) the univalent radical -COOH; present in and characteristic of organic acids | Synonyms: carboxyl group |
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| chlorophyl | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyll |
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| chrysoberyl | (noun) a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone | - |
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| dactyl | (noun) a finger or toe in human beings or corresponding body part in other vertebrates | Synonyms: digit |
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| (noun) a metrical unit with stressed-unstressed-unstressed syllables | - |
| ethyl | (noun) the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom | Synonyms: ethyl group, ethyl radical |
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| glyceryl | (noun) a trivalent radical derived from glycerol by removing the three hydroxyl radicals | - |
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| hydroxyl | (noun) the monovalent group -OH in such compounds as bases and some acids and alcohols | Synonyms: hydroxyl group, hydroxyl radical |
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| hydroxymethyl | (noun) a methyl with hydroxide replacing the hydrogen atoms | - |
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| idyl | (noun) a short poem descriptive of rural or pastoral life | Synonyms: bucolic, eclogue, idyll |
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| (noun) a musical composition that evokes rural life | Synonyms: idyll, pastoral, pastorale |
| methyl | (noun) the univalent radical CH3- derived from methane | Synonyms: methyl group, methyl radical |
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| perissodactyl | (noun) placental mammals having hooves with an odd number of toes on each foot | Synonyms: odd-toed ungulate, perissodactyl mammal |
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| propyl | (noun) the monovalent organic group C3H7- obtained from propane | Synonyms: propyl group, propyl radical |
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| pterodactyl | (noun) extinct flying reptile | - |
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| sibyl | (noun) (ancient Rome) a woman who was regarded as an oracle or prophet | - |
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| (noun) a woman who tells fortunes | - |
| sporophyl | (noun) leaf in ferns and mosses that bears the sporangia | Synonyms: sporophyll |
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| tetryl | (noun) a yellow crystalline explosive solid that is used in detonators | Synonyms: nitramine |
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| uranyl | (noun) the bivalent radical UO2 which forms salts with acids | Synonyms: uranyl group, uranyl radical |
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| vinyl | (noun) a univalent chemical radical derived from ethylene | Synonyms: vinyl group, vinyl radical |
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| (noun) shiny and tough and flexible plastic; used especially for floor coverings | - |
| xanthophyl | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyll |
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