finger stick or fin·ger·stick (f?ng?g?r-st?k?)n. The drawing of blood from the fingertip, usually with a thin blade and a micropipette, for diagnostic testing.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.