Definition of hackly in US English:

hackly

adjective

  • Rough or jagged; (of a metal or mineral, or its surface) having a rough, jagged texture characterized by the presence of numerous short sharp points.

Origin

Late 18th century; earliest use found in Richard Kirwan (1733–1812), chemist and mineralogist. From hackle + -y.

Pronunciation

hackly

/ˈhakli/