evaginate
verb
[ ɪˈvadʒɪneɪt ]
• (with reference to a tubular or pouch-shaped organ or structure) turn or be turned inside out.
• "the sacs evaginate and come to lie externally"
Origin:
mid 17th century: from Latin evaginat- ‘unsheathed’, from the verb evaginare, from e- (variant of ex- ) ‘out of’ + vagina ‘sheath’.
