This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of loin.

n. The lower abdomen, groin and genitalia.

n. the region of the hips and groin and lower abdomen

n. the lower part of the abdomen just above the external genital organs

"But "loins" is what we should expect, not "belly" (womb), which applies to the woman."

body part    region    area   

lumbo-    lumbosacral    lumbar    lumb-    lumbago