Definition of evert in English:



[with object]Biology Physiology
  • Turn (a structure or organ) outwards or inside out.

    ‘the brown hyena deposits chemicals by everting an anal pouch’
    ‘the characteristic facial appearance of full, often everted lips’
    • ‘The cyst wall is then everted and approximated to the edge of the vestibular mucosa with interrupted 2-0 absorbable suture.’
    • ‘These nozzles could not be confused with ‘eversible gland openings,’ as described by Forsyth, or the obviously everted female spermatheca.’
    • ‘To facilitate patellar cartilage removal, the first assistant clamps the medial edges of the tendons above and below the patella and everts the tissue.’
    • ‘Most Asteroidea are predators or scavengers, everting their stomach (called a cardiac stomach), which secretes digestive enzymes on their prey.’
    • ‘They feed by grasping the prey, then everting their stomach and secreting primary enzymes on the prey.’
    turn inside out
    View synonyms


Mid 16th century (in the sense ‘upset, overthrow’): from Latin evertere, from e- (variant of ex-) ‘out’ + vertere ‘to turn’. The current sense dates from the late 18th century.