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os intermetatarseum

(ĭn′tər-mĕt′ə-tärsē-əm)
n.
  1. A supernumerary bone at the base of the first metatarsal bone or between the first and second metatarsal bones, usually fused with one or the other or with the medial cuneiform bone.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.