Strong's #3391: yerach (pronounced yeh'-rakh)
from a unused root of uncertain signification; a lunation, i.e. month:--month, moon.
Brown-Driver-Briggs Hebrew Lexicon:
yerach
1) month (lunar cycle), moon
1a) month
1b) calendar month
Part of Speech: noun masculine
Relation: from a unused root of uncertain signification
Usage:
This word is used 13 times:
Exodus 2:2: "was a goodly child, she hid him three months."
Deuteronomy 21:13: "her father a full month: and after that thou shalt go in"
Deuteronomy 33:14: "fruits brought forth by the sun, and for the precious things put forth by the moon,"
1 Kings 6:37: "was the foundation of the house of the LORD laid, in the month Zif:"
1 Kings 6:38: "And in the eleventh year, in the month Bul, which is the eighth month,"
1 Kings 8:2: "king Solomon at the feast in the month Ethanim, is the seventh month."
2 Kings 15:13: "of Judah; a full month in Samaria."
Job 3:6: "let it not come of the months."
Job 7:3: "So am I made to possess months of vanity, and wearisome nights are appointed"
Job 29:2: "Oh that I were as in months past, as in the days when God preserved"
Job 39:2: "Canst thou number the months that they fulfill? or knowest thou the time when they bring forth?"
Isaiah 60:20: "more go down; neither shall thy moon withdraw itself: for the LORD shall be"
Zechariah 11:8: "shepherds also I cut off in one month; and my soul loathed them, and their soul also"