bio2 /ˈbʌɪəʊ / ‹informal›

b

I. noun [ mass noun]

1.
(US) biology

I majored in bio and I’m waiting to see about med school.
II. adjective

biological

dogs are used at the airport to sniff out plant and other bio materials
he’s never met his bio dad.
– origin 1940s: abbreviation.

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