Strong’s Hebrew
H2910 — tuwchah
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
טֻחָה
tuwchah — pronounced too-khaw
from 2909 (or 2902) in the sense of overlaying; (in the plural only) the kidneys (as being covered); hence (figuratively) the inmost thought:--inward parts. see H02909 see H02902
2 occurrences in the KJV.
Job 38:36
Who hath put wisdom in the inward parts? or who hath given understanding to the heart?
Psalms 51:6
Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.