vb, -nat*ed  -nat*ing vt  1  :  to cover or enclose (as within the body) <external … sex organs of the male, contrasted to the invaginatedorgans of the female -Yr. Bk. of Neurology, Psychiatry & Neurosurgery>   2  :  to fold in so that an outer becomes an inner surface < the sac into the lumen -E. A. Graham>  vi  :  to undergo invagination .
 
 
 
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