Definition of pheno- in English:

pheno-

Syllabification: pheno-
(also phen- before a vowel)

combining form

1 Chemistry Derived from benzene: phenobarbital
2Showing: phenotype

Origin

sense 1 from French phényle 'phenyl', from Greek phaino- 'shining'; both senses from Greek phainein 'to show'.

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a know-it-all…