retroflex
Concise Oxford English Dictionary © 2008 Oxford University Press:
retroflex /ˈrɛtrə(ʊ)flɛks/ (also retroflexed)
▶adjective
- 1 Anatomy & Medicine turned backwards.
- 2 Phonetics pronounced with the tip of the tongue curled up towards the hard palate.
– derivatives
retroflexion noun.
retroflexion noun.
– origin C18: from L. retroflex-, retroflectere ‘bend backwards’.
'retroflex' also found in these Oxford entries:

