Scrabble Dictionary

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Yes, ramus is playable

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"Ramus" Definition

noun

A bony process extending like a branch from a larger bone, especially the ascending part of the lower jaw that makes a joint at the temple.
A branch, as of a plant, nerve, or blood vessel.
The posterior more or less vertical part on each side of the lower jaw that articulates with the skull.
A branch of a nerve .
a projecting part, elongated process, or branch as.