Here you will find one or more explanations in English for the word Umbona.
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Subumbonal
Subumbonal Sub`um*bo"nal, a. (Zo["o]l.)
Beneath or forward of the umbos of a bivalve shell.
UmbonateUmbonate Um"bo*nate, Umbonated Um"bo*na`ted, a. [NL.
umbonatus. See Umbo.]
Having a conical or rounded projection or protuberance, like
a boss. UmbonatedUmbonate Um"bo*nate, Umbonated Um"bo*na`ted, a. [NL.
umbonatus. See Umbo.]
Having a conical or rounded projection or protuberance, like
a boss.
Meaning of Umbona from wikipedia