Definition of open-headed in US English:

open-headed

adjective

  • 1Of a cask, barrel, etc.: completely open at one end.

  • 2Of a plant, tree crown, inflorescence, etc.: having loose growth without a compact core or heart.

Origin

Late Middle English (in an earlier sense). From open + headed.

Pronunciation

open-headed

/ˌəʊp(ə)nˈhɛdɪd/