Jello sign

A popular term for the characteristic undulation of the scrotum that occurs with foetal limb movement, a ‘soft’ criterion for determining an infant’s sex by ultrasonography; seen after the 22nd gestational week, the movement is likened to the jiggle of the proprietary brand of instant gelatin
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Jello sign

Obstetrics A popular term for the characteristic undulation of the scrotum that occurs with fetal limb movement, a 'soft' criterion for determining an infant's sex by ultrasonography; seen after the 22nd gestational wk, the movement is likened to the jiggle of a proprietary brand of instant gelatin.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.