noun

1. Base, bottom, minimum

2. Any basal structure or part

adjective

1. Basic, elementary; relating to, or forming, the base, or point of origin.

   “A basal reader is a kind of book that is used to teach reading.”

2. Associated with the base of an organism or structure.

   “In the spring, basal leaves emerge from a stout taproot.”

3. Of a minimal level that is necessary for maintaining the health or life of an organism.

   “a basal diet”

Synonyms: basilar