thio-


a combining form meaning “sulfur,” used in chemical nomenclature in the names of compounds in which part or all of the oxygen atoms have been replaced by sulfur; often used to designate sulfur analogues of oxygen compounds.

Nearby words

  1. thinspiration,
  2. thinspo,
  3. thio,
  4. thio acid,
  5. thio salt,
  6. thio-ether,
  7. thioacetamide,
  8. thioacetic,
  9. thioacetic acid,
  10. thioacid

Also especially before a vowel, thi-.

Origin of thio-

combining form representing Greek theîon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for thio-

thio-

before a vowel thi-

combining form

indicating that a chemical compound contains sulphur, esp denoting that a compound is derived from a specified compound by the replacement of an oxygen atom with a sulphur atomthiol; thiosulphate

Word Origin for thio-

from Greek theion sulphur

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

Medicine definitions for thio-

thio-

pref.

Containing sulfur, used especially of a compound in which oxygen has been replaced by a divalent sulfur:thioacid.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for thio-

thio-

thi-

A prefix that means “containing sulfur,” used especially of a compound in which an oxygen atom has been replaced by a sulfur atom, as in thiourea.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.