Strong's #3718: kephel (pronounced keh'-fel)
from 3717; a duplicate:--double.
Brown-Driver-Briggs Hebrew Lexicon:
ּ
kephel
1) double, a doubling
Part of Speech: noun masculine
Relation: from H3717
Usage:
This word is used 3 times:
Job 11:6: "thee the secrets of wisdom, that they are double to that which is! Know therefore that God"
Job 41:13: "of his garment? can come to him with his double bridle?"
Isaiah 40:2: "for she hath received of the LORD's hand double for all her sins."