Strong's #4221: moach (pronounced mo'-akh)
from the same as 4220; fat, i.e. marrow:--marrow.
Brown-Driver-Briggs Hebrew Lexicon:
môach
1) marrow
Part of Speech: noun masculine
Relation: from the same as H4220
Usage:
This word is used 1 times:
Job 21:24: "of milk, and his bones are moistened with marrow."