a. [f. as prec. + -ATE.]
1. Furnished with, rising up in, an umbo or boss. Chiefly Bot.
1829. Loudon, Encycl. Plants (1836), 987. Agaricus asper.… Cap somewhat umbonate rough with acute warts.
1857. Berkeley, Cryptog. Bot., § 532. In the other genus [Cryptangium]…, the operculum is acuminate instead of umbonate.
1887. W. Phillips, Brit. Discomycetes, 393. Spermogonia … punctiformi, black, acutely umbonate.
2. Formed into an umbo or knob.
1891. Cent. Dict.
So Umbonated a. rare–1.
1752. Hill, Hist. Anim., 127. The fine, roundish, umbonated Cochlea.
1847. Webster, Umbonated, in botany, having a boss or elevated point in the middle.
