1) in cabling. hardware to which support cable is affixed. 2) in rigging. the point at which the rigging system is secured or where friction is controlled.

Merriam-Webster Online Dictionary
anchor (noun)
a device usually of metal attached to a ship or boat by a cable and cast overboard to hold it in a particular place by means of a fluke that digs into the bottom
a reliable or principal support - mainstay
something that serves to hold an object firmly
an object shaped like a ship's anchor
an or - anchorman anchorwoman
the member of a team (as a relay team) that competes last
a large business (as a department store) that attracts customers and other businesses to a shopping center or mall
a fixed object (as a tree or a piton) to which a climber's rope is secured
anchor (verb)
transitive verb
to hold in place in the water by an anchor - anchor a ship
to secure firmly - fix anchor a post in concrete
intransitive verb
to act or serve as an anchor for - it is she who is anchoring the rebuilding campaign G. D. Boone anchoring the evening news
to cast anchor
to become fixed
anchor (Wikipedia)

Stockless ship's anchor and chain on display
Anchor of Amoco Cadiz in Portsall, north-west Brittany, France

An anchor is a device, normally made of metal, used to connect a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ancora, which itself comes from the Greek ἄγκυρα (ankura).

Anchors can either be temporary or permanent. Permanent anchors are used in the creation of a mooring, and are rarely moved; a specialist service is normally needed to move or maintain them. Vessels carry one or more temporary anchors, which may be of different designs and weights.

A sea anchor is a drogue, not in contact with the seabed. It is used to control a drifting vessel, or to limit the speed of a sailing yacht running "under bare poles" in a storm.

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