from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. paired twice
- adj. conjugate in two ways
from the GNU version of the Collaborative International Dictionary of English
- adj. Twice paired, as when a petiole forks twice.
from The Century Dictionary and Cyclopedia
- In pairs; placed side by side.
- In botany, twice paired, as when each of the divisions of a forked petiole bears a pair of leaflets.
bi- + conjugate (Wiktionary)