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Webster 1913 Edition

Noun.

(Naut.)

Either half of a square-rigged vessel’s yard{6}, from the center or mast to the end.

☞ Ships are said to be yardarm and yardarm when so near as to touch, or interlock yards.

See also: yard-arm

yardarm ‎(plural yardarms)

(nautical) The outer end of a yard, often equipped with blocks for reeving signal halyards.

outer end of a yard