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sphero-

  1. a combining form representing sphere in compound words: spherometer.
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Also sphaero-, -sphere; especially before a vowel, spher-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sphero- in Medicine

sphero-

pref.
  1. Sphere; spherical:spherocyte.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.