Hourglass

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Referring to a cylindrical or elongated structure with a central constriction likened, sometimes in only a very general sense, to an hourglass
References in periodicals archive ?
Using simple blocks with shapes like cubes or hourglasses, researchers have found ways to construct strong panels with no fasteners securing most of the blocks.
"These temporal trends are at odds with claims that centerfolds' body shapes are still more 'hourglasses' than 'stick insects,' and that the maximally sexually attractive female waist:hip ratio is stable," the researchers concluded.