Definition of sero- in English:

sero-

Pronunciation: /ˈsɪərəʊ/

combining form

1Relating to serum: serotype

Origin

representing serum.

Definition of sero- in:

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