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Definition of Pheno-
1. Prefix. (biology) Prefix indicating an observable characteristic. Example: phenotype. ¹
2. Prefix. (organic chemistry) Used in IUPAC names to indicate the presence of a phenol group. Example: phenobarbital. ¹
¹ Source: wiktionary.com
Medical Definition of Pheno-
1. 1. Combining form denoting appearance. 2. In chemistry, combining form denoting derivation from benzene (phenyl-). Origin: fr. G. Phaino, to appear, show forth (05 Mar 2000)