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The Collaborative International Dictionary
Reniform

Reniform \Ren"i*form\ (r?n"?-f?rm; 277), a. [L. renes kidneys + -form: cf. F. r['e]niforme.] Having the form or shape of a kidney; as, a reniform mineral; a reniform leaf.

Wiktionary
reniform

a. 1 Shaped like a kidney; having a circular or roughly circular shape with a notch."reniform." Dictionary.com Unabridged (v 1.1). Random House, Inc. 10 Apr. 2007. . 2 (context botany of leaves English) Shaped like a kidney, with the petiole attached at the notch.

WordNet
reniform

adj. of a leaf or bean shape resembling the shape of kidney [syn: kidney-shaped]

Usage examples of "reniform".

The seed, reniform in shape, is bivalved, and constitutes about two-thirds of the bulk of the entire plum, and the inner kernel two-thirds the bulk of the seed.