anhedral

 
Pronunciation: /anˈhiːdr(ə)l, -ˈhɛd-/

adjective

Crystallography
  • (of a crystal) having no plane faces.

noun

[mass noun] Aeronautics
  • downward inclination of an aircraft’s wing. Compare with dihedral.

Origin:

late 19th century (as an adjective): from an-1 'not' + -hedral (see -hedron)