umbonate
/ˈʌmbəneɪt/
adjective
- Having a rounded, raised knob or bump in the center, like a shield boss or a mushroom cap.
- Botanists described the leaf as umbonate because of its raised central spot.
- The mushroom had an umbonate cap with a distinct central bump.
- The ancient shield was umbonate, with a metal boss in the middle for protection.
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