Definition of pheno- in English:

pheno-

Pronunciation: /ˈfiːnəʊ, ˈfɛnəʊ/
(also phen- before a vowel)

combining form

1 Chemistry Derived from benzene: phenobarbitone
2Showing: phenotype

Origin

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

Definition of pheno- in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous