| a. | 1. | Relating to, or forming, the base.
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| Adj. | 1. | basal - 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" Synonyms: radical |
| 2. | basal - serving as or forming a base; "the painter applied a base coat followed by two finishing coats" Synonyms: base | |
| 3. | basal - of primary importance; "basic truths" |