Etymology
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basal (adj.)

"relating to or situated at a base," 1826, from base (n.) + -al (1).

updated on October 12, 2017

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Definitions of basal from WordNet

basal (adj.)
of or being the essential or basic part;
a basal reader
basal (adj.)
serving as or forming a base;
Synonyms: base
basal (adj.)
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
Synonyms: radical
From wordnet.princeton.edu, not affiliated with etymonline.