Definition of tiercel in English:

tiercel

(also tercel)

Pronunciation /ˈtirsəl/ /ˈtɪrsəl/

noun

Falconry
  • The male of a hawk, especially a peregrine or a goshawk.

Origin

Middle English from Old French, based on Latin tertius ‘third’, perhaps from the belief that the third egg of a clutch produced a male.