Dictionary.com
definitions

cystathionine

[sis-tuh-thahy-uh-neen, -nin]
noun Biochemistry.
  1. an amino acid, C7H14O4N2S, that is an intermediate in the transfer of sulfur from methionine to cysteine.

Origin of cystathionine

cyst(eine) + -a- + (me)thionine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
cystathionine in Medicine

cystathionine

[sĭs′tə-thī′ə-nēn′, -nīn′]
n.
  1. An intermediate in the conversion of methionine to cysteine.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.