noun
seagoing vessel; oceangoing ship
A ship designed for open-sea or ocean voyages, as opposed to coastal or inland-water vessels. Often used in technical or nautical contexts.
この港には大型の航洋船が停泊している。
A large oceangoing ship is anchored at this port.
航洋船の設計には厳しい安全基準が適用される。
Strict safety standards apply to the design of seagoing vessels.
内航船 is a domestic or coastal vessel, contrasting with 航洋船 which is built for ocean voyages.
Compound of 航 (sailing, navigation), 洋 (ocean), and 船 (ship). The word transparently means 'ocean-going ship'.