Strong's #4668: maphteach (pronounced maf-tay'-akh)

from 6605; an opener, i.e. a key:--key.

Brown-Driver-Briggs Hebrew Lexicon:

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maphtêach

1) key, opening instrument

Part of Speech: noun masculine

Relation: from H6605

Usage:

This word is used 3 times:

 

Judges 3:25: "of the parlor; therefore they took a key, and opened them: and, behold, their lord was fallen down"
1 Chronicles 9:27: "because the charge was upon them, and the opening thereof every morning pertained to them."
Isaiah 22:22: " And the key of the house of David will I lay upon his shoulder; so he shall open, and none"