umbonalEnglishOxford New American Dictionaryumbonal /ˌəmˈbōnl, ˌəmˈboʊnl / ▸ adjective mainly Zoology relating to or of the nature of an umbo or rounded protruberance: the species lacks a prominent umbonal ridge.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
EnglishOxford New American Dictionary