MAST;
wikipedia,
The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the centre-line of a ship or boat. Its purposes include carrying sail, spars, and derricks, and giving necessary height to a navigation light, look-out position, signal yard, control position, radio aerial or signal lamp.
Dictionary.com,
a spar or structure rising above the hull and upper portions of a ship or boat to hold sails, spars, rigging, booms, signals, etc., at some point on the fore-and-aft line, as a foremast or mainmast.
any of a number of individual spars composing such a structure, as a topmast supported on trestletrees at the head of a lower mast.
any of various portions of a single spar that are beside particular sails, as a top-gallant mast and royal mast formed as a single spar.
Also called pillar. the upright support of a jib crane.
any upright pole, as a support for an aerial, a post in certain cranes, etc.
Webster dictionary,
a long pole or spar rising from the keel or deck of a ship and supporting the yards, booms, and rigging
a slender vertical or nearly vertical structure (as an upright post in various cranes)
Wikipedia,
A strut is a structural component designed to resist longitudinal compression. Struts provide outwards-facing support in their lengthwise direction, which can be used to keep two other components separate, performing the opposite function of a tie. They are commonly used in architecture and engineering.
Aircraft
Lift struts were commonly used in early aircraft to support wings, stabilizers, control frames in gliders and hang gliders, and in landing gear
Dictionary.com
noun
a structural member used mainly in compression, esp as part of a framework
Webster
a structural piece designed to resist pressure in the direction of its length
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From Wikipedia,
In boats and ships, keel can refer to either of two parts: a structural element that sometimes resembles a fin and protrudes below a boat along the central line, or a hydrodynamic element. These parts overlap
Dictionary.com,
Nautical. a central fore-and-aft structural member in the bottom of a hull, extending from the stem to the sternpost and having the floors or frames attached to it, usually at right angles: sometimes projecting from the bottom of the hull to provide stability.
Webster,
the chief structural member of a boat or ship that extends longitudinally along the center of its bottom and that often projects from the bottom
Encyclopædia Britannic
keel, in shipbuilding, the main structural member and backbone of a ship or boat, running longitudinally along the centre of the bottom of the hull from stem to stern. It may be made of timber, metal, or other strong, stiff material. Traditionally it constituted the principal member to which the ribs were attached on each side and to which the stem and sternpost were also attached. Another type of main keel—properly, the “full keel,” or “ballast keel”—is a vertical downward extension of the boat’s hull, narrowly V-shaped; it is usually ballasted or weighted for stability and lateral resistance.
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