Definition of northwesternmost in US English:

northwesternmost

adjective

  • Situated furthest to the north-west.

Origin

Late 18th century; earliest use found in William Bligh (1754–1817), naval officer and colonial governor. From north-western + -most.

Pronunciation

northwesternmost

/ˌnɔːθˈwɛst(ə)nməʊst/