The inmost, choicest, or essential part; the pith.(noun)
Strength or vigor; vitality.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "marrow" in a sentence
"In the bodies of the long bones the marrow is of a yellow color, and contains, in 100 parts, 96 of fat, 1 of areolar tissue and vessels, and 3 of fluid with extractive matter; it consists of a basis of connective tissue supporting numerous bloodvessels and cells, most of which are fat cells but some are marrow cells, such as occur in the red marrow to be immediately described."
"The red marrow consists of a small quantity of connective tissue, bloodvessels, and numerous cells (Fig. 72), some few of which are fat cells, but the great majority are roundish nucleated cells, the true marrow cells of Kölliker."
"Before chemotherapy treatment begins, marrow is removedfrom the bones and stored; the marrow is then replaced."