UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/rɪˈtrɔːs/US:USA pronunciation: respellingUSA pronunciation: respelling(ri trôrs, rētrôrs)

WordReference Random House Unabridged Dictionary of American English © 2020
re•trorse  (ri trôrs, rētrôrs),USA pronunciation adj. 
  1. turned backward.
re•trorsely, adv. 
  • Latin retrōrsus, contracted form of retrōversus bent backward, equivalent. to retrō- retro- + versus (past participle of vertere to turn); see retroversion
  • 1815–25

Collins Concise English Dictionary © HarperCollins Publishers::
retrorse /rɪˈtrɔːs/ adj
  1. (esp of plant parts) pointing backwards or in a direction opposite to normal
Etymology: 19th Century: from Latin retrōrsus, shortened form of retrōversus turned back, from retro- + vertere to turn

reˈtrorsely adv
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