veinstone

or vein stone

[veyn-stohn]
Also called phleb·o·lith [fleb-uh-lith] /ˈflɛb ə lɪθ/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phlebolith

veinstone

noun
  1. another word for gangue
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

phlebolith in Medicine

phlebolith

[flĕbə-lĭth′]
n.
  1. A calcareous deposit in a venous wall or thrombus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.