oceangoing

US: /ˈoʊʃənˌgoʊɪŋ/ ,(ō′shən gō′ing)

WordReference Random House Learner's Dictionary of American English © 2025

o•cean•go•ing or o•cean-go•ing/ˈoʊʃənˌgoʊɪŋ/   adj. [before a noun]

1. Naval Terms (of a ship) designed and equipped to travel on the open sea.

WordReference Random House Unabridged Dictionary of American English © 2025

o•cean•go•ing  (ō′shən gō′ing), adj. 

1. Naval Terms (of a ship) designed and equipped to travel on the open sea.
2. Naval Terms noting or pertaining to sea transportation:
   oceangoing traffic.

Also, o′cean-go′ing. 

• ocean + going 1880–85

Collins Concise English Dictionary © HarperCollins Publishers::

ocean-going adjective

1. (of a ship, boat, etc) suited for travel on the open ocean