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baseball finger

(bāsbôl′)
n.
  1. Permanent flexion of the terminal phalanx of a finger due to a break in the extensor tendon resulting from a blow from a ball or other object.hammer finger mallet finger
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.