Associated with the base of an organism or structure.
Basic, elementary; relating to, or forming, the base, or point of origin.
In a phylogenetic tree, being a group, or member of a group, which diverged earlier. The earliest clade to branch in a larger clade.
Of a minimal level that is necessary for maintaining the health or life of an organism.
base, bottom, minimum
Any basal structure or part
Of or pertaining to a configuration.
Of a language: having a relatively fixed style of grammar where the subject of a sentence is outside the finite verb phrase but the object is inside it.