Definition of sex- in English:

sex-

combining form

Variant spelling of sexi-, shortened before a vowel (as in sexennial), or shortened before a consonant (as in sexfoil).

Definition of sex- in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily