Deadweight means, when measured in water of specific gravity 1.025, the difference in long tons between -
(1) The displacement of the vessel on even trim at “lightweight” as defined by subpart F of part 170 of this chapter; and
(2) The displacement of the vessel on even trim at the deepest load waterline.
46 CFR § 125.160
Each term defined elsewhere in this chapter for a particular class of vessel applies to this subchapter unless a different definition is given in this section. As used by this subchapter -