something that is glabrous is generally something smooth to the touch without any pubescence, or hairs, on it. This word is widely used in plant identification terminology, such as in the Jepson Manual for example, usually to refer to leaves.

Gla"brous (?), a. [L. glaber; cf. Gr. hollow, smooth, to hollow.]

Smooth; having a surface without hairs or any unevenness.

 

© Webster 1913.

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