| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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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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| acylation | (noun) the process of introducing an acyl group into a compound | - |
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| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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