Definition of Basal

Adjective: basal bey-zul or bey-sul [N. Amer], bey-sul [Brit]

(botany) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem
"basal placentation";
- radical
Serving as or forming a base
"the painter applied a basal coat followed by two finishing coats";
- base
Of primary importance
- primary