1 Also spelt tyer, the gasket used aboard yachts to secure a sail to the main boom.
2 The name given to a row of mooring buoys in a port for barges or lighters, or a wharf or quay where barges can lie alongside three or four deep, with the inside barge secured to the wharf. See also trot.
3 A regular row or layer of anything, such as a tier of casks in the hold of a ship. See also cable-tier; coil; ground tier.
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