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janiceps in Medicine

janiceps

(jănĭ-sĕps′)
n.
  1. A set of conjoined twins whose heads are fused together, with the faces looking in opposite directions.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.