tank ship n 1: a cargo ship designed to carry crude oil in bulk [syn: {oil tanker}, {oiler}, {tanker}, {tank ship}]
Tank ship \Tank ship\, Tank vessel \Tank vessel\ . (Naut.) A vessel fitted with tanks for the carrying of oil or other liquid in bulk; -- called also {tanker}. A tank ship of very large capacity is called a {supertanker}. [Webster 1913 Suppl. +PJC]