Dictionary.com
definitions

microlith

[mahy-kruh-lith]
noun Archaeology.
  1. a tiny stone tool, often of geometric shape, made from a bladelet and mounted singly or in series as the working part of a composite tool or weapon, especially during late Upper Paleolithic and Mesolithic times.
Compare macrolith, tranchet.

Origin of microlith

First recorded in 1875–80; micro- + -lith
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for microlith

microlith

noun
  1. archaeol a small Mesolithic flint tool which was made from a blade and formed part of hafted tools
Derived Formsmicrolithic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
microlith in Medicine

microlith

[mī′krə-lĭth′]
n.
  1. A minute calculus, usually multiple and resembling coarse sand.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
microlith in Science

microlith

[mī′krō-lĭth′]
  1. A very small blade made of flaked stone and used as a tool, especially in the European Mesolithic Period.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.