BASAL

adj. of the base, at or forming the base

Basal is a term with several scientific meanings:Basal (phylogenetics) is the opposite of "derived" in phylogenetics.Basal (medicine) refers to a type of insulin dosing.The basal ganglia is a region of the brain.The basal lamina is the surface on which epithelial cells are attached.An anatomical term of location, for features associated with the base of an organism or structure, such as the end of a sponge that adheres to its substrate.
See more at Wikipedia.org...

Adjective
1. 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 leaves"
(synonym) radical
(classification) botany, phytology
2. serving as or forming a base; "the painter applied a base coat followed by two finishing coats"
(synonym) base
(similar) basic
3. of primary importance; "basic truths"
(synonym) basic, primary
(similar) essential

adj. basal

adj. basal