SINCE 1828
Plimsoll mark
nounDefinition of Plimsoll mark
: a load line or a set of load-line markings on an oceangoing cargo ship
— called also Plimsoll line
Illustration of Plimsoll mark
Plimsoll mark: TF tropical freshwater mark; F freshwater mark; T tropical load line; S summer load line; W winter load line; WNA winter load line, North Atlantic
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Merriam-Webster unabridged
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