1.Definition: 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"

Related Adjective(s):radical

2.Definition: of or being the essential or basic part

"A basal reader"

Related Adjective(s):elemental, elementary, primary

3.Definition: serving as or forming a base

Related Adjective(s):base