microsyringe

[mī′krō-sə-rĭnj, -sîrĭnj]
n.
  1. A hypodermic syringe having a micrometer screw attached to the piston, thus allowing accurately measured minute quantities of fluid to be injected.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.