Scrabble Dictionary

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Yes, umbo is playable

...and is worth 11 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Umbo" Definition

noun

Anatomy A small projection at the center of the outer surface of the eardrum.
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.
The boss or knob at the center of a shield.
The boss of a shield.
a rounded elevation as.

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