<. The noun meaning "a biennial plant" is attested by 1770.
- Completing a life cycle normally in two growing seasons.
- A biennial plant. In the first year, biennials normally produce a short stem, a rosette of leaves, and a fleshy root that acts as food supply. In the second season, biennials blossom, produce seed, use up their food supply, and die. Carrots, parsnips, and sugar beets are examples of biennials. Compare annual perennial.