Definition of sero- in English:

sero-

Pronunciation: /ˈsɪərəʊ/

combining form

1Relating to serum: serotype
1.1Involving a serous membrane: serositis

Origin

representing serum.

Definition of sero- in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something