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head cap

n.
  1. acrosomal cap
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Examples from the Web for head cap

Historical Examples of head cap

  • The usual method of removing a book from the shelf is to hook a finger into the top of the back, or head-cap, and pull.

    Book Repair and Restoration

    Mitchell Buck

  • The edges of the boards may have a gold line run on them, and the head-cap may be decorated with a few dots.