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umbo

Flag: gbEnglishOxford New American Dictionary
umbo /ˈəmbō, ˈəmboʊ /
▸ noun
(plural umbones /ˌəmˈbōnēz/ or umbos)
1 historical the central boss of a shield.
2 Biology a rounded knob or protuberance.
▪ Zoology the highest point of each valve of a bivalve shell.
▪ Botany a central swelling on the cap of a mushroom or toadstool.
– ORIGIN early 18th century : from Latin, ‘shield boss’.
umbo — ONAD · Shobdo