Search: umbo
Why: In the In Touch Weekly crossword, #84 across: "Convex shape"
UMBOAnswer: 1. The boss or knob at the center of a shield.
2. Biology A knoblike protuberance arising from a surface, as the prominence near the hinge of a bivalve shell or the projection at the scale tip of a seed-bearing cone.
Anatomy A small projection at the center of the outer surface of the eardrum.
Source: TheFreeDictionary
The More You Know: The entry is accompanied by this helpful picture:
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