Basic, elementary; relating to, or forming, the base, or point of origin. Example: A basal reader is a kind of book that is used to teach reading.
Associated with the base of an organism or structure. Example: In the spring, basal leaves emerge from a stout taproot.
Of a minimal level that is necessary for maintaining the health or life of an organism. Example: a basal diet
In a phylogenetic tree, being a group, or member of a group, which diverged earlier. The earliest clade to branch in a larger clade. Example: A magnolia is a basal angiosperm.
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