a. [f. L. ad to + umbra shade + -AL 1; with reference to adumbrāre, ADUMBRATE v. 4.]

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  1.  Of overshadowing nature; shady.

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1845.  Blackw. Mag., LVII. 246. This circular adumbral and pluvial roofing had to be adapted to the female head.

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  2.  Zool. A shortened equivalent of ADUMBRELLAR.

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1881.  E. R. Lankester, in Jrnl. Microsc. Sc., Jan., 124. The cells of the adumbral walls are like those of the ring-canals.

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