Cu. Abbreviation for 'Cumulus'.
Cuckold's Knot (Neck). Used for securing ropes to a spar. SomeĀthing like clove hitch but both ends come out in same direction.
Cuddy. Cabin in fore part of a boat or small craft.
Culage. Laying up of a vessel, in dock, for repairs.
Culmination. Coming to the meridian. Point at which altitude of a heavenly body has its greatest or least altitude; the former being the upper culmination, the latter the lower culmination.
Culverin.* Sixteenth century cannon. From 10 to 12 ft. long and 5j-in. calibre. Threw 18-lb. shot about two miles. Name means 'Serpent'.
Cumulonimbus. Heavy mass of cloud rising to considerable height. Sometimes anvil-shaped at top. Associated with rain, hail, lightning and thunder.
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