WordReference Random House Learner's Dictionary of American English © 2020
-som-, root. 
  1. -som- comes from Greek, where it has the meaning "body.'' This meaning is found in such words as: chromosome, psychosomatic.

Collins Concise English Dictionary © HarperCollins Publishers::
Som. abbreviation for
  1. Somerset
'Som' also found in these entries (note: many are not synonyms or translations):
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