umbo, gen. umbonis, pl. umbones (um´bo, -bo-nis, -bo-nes)

1. [NA] A projecting point of a surface. 2. u. of tympanic membrane [L. boss of a shield, a knob]
u. membra´nae tym´pani [NA] u. of tympanic membrane
u. of tympanic membrane the projection on the inner surface of the tympanic membrane at the end of the manubrium of the malleus; this corresponds to the most depressed point of the membrane, viewed laterally, that is commonly called the umbo.u. membranae tympani [NA], umbo (2);


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