Definition of loin
1a
: the part of a human being or quadruped on each side of the spinal column between the hip bone and the false ribs
b
: a cut of meat comprising this part of one or both sides of a carcass with the adjoining half of the vertebrae included but without the flank
2
loins plural
a
: the upper and lower abdominal regions and the region about the hips
b(1)
: the pubic region
(2)
: the reproductive organs
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Merriam-Webster unabridged
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Time Traveler for loin
The first known use of loin was in the 14th century
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