Vine's Expository Dictionary: View Entry
μυελός myelós, moo-el-os'; perhaps a primary word; the marrow:—marrow.
The KJV translates Strong's G3452 in the following manner: marrow (1x).
marrow
Strong's Number G3452 matches the Greek μυελός (myelos), which occurs 1 times in 1 verses in the TR Greek.
View OT results in the LXX Greek concordance
View NT results in the MGNT Greek concordance
Heb 4:12