Strong's Concordance

Original word: אַצִּילֵי
Transliteration: atstsil
Definition (short): armpits
Definition (full): a joint of the hand, a party-wall

NAS Exhaustive Concordance

Word Origin: from the same as etsel
Definition: a joining, joint
NASB Translation: armpits* (1), long (1), wrists* (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From 'atsal (in its primary sense of uniting); a joint of the hand (i.e. Knuckle); also (according to some) a party-wall (Ezek. 41:8) -- (arm) hole, great.

see HEBREW 'atsal

KJV: And Ebedmelech the Ethiopian said unto Jeremiah, Put now these old cast clouts and rotten rags under thine armholes under the cords. And Jeremiah did so.
NASB: Then Ebed-melech the Ethiopian said to Jeremiah, "Now put these worn-out clothes and rags under your armpits under the ropes"; and Jeremiah did so.
KJV: I saw also the height of the house round about: the foundations of the side chambers were a full reed of six great cubits.
NASB: I saw also that the house had a raised platform all around; the foundations of the side chambers were a full rod of six long cubits in height.