This is the 1742nd most frequent French word.
bio
"Bio" in French means "organic" (referring to food or farming).
Here, 'bio' is used as an adjective referring to 'organic', describing food produced naturally without synthetic chemicals.
Je préfère acheter des légumes bio.
I prefer to buy organic vegetables.
In this sentence, 'bio' is used informally as a noun, short for 'biologie' (biology), referring to the scientific study of life and organisms.
Le cours de bio cette année est passionnant.
The biology class this year is fascinating.
'Bio' here qualifies the product, indicating its compliance with organic standards, emphasizing its natural origin.