Hypertext Webster Gateway: "yardarm"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Yardarm \Yard"arm`\, n. (Naut.)
Either half of a square-rigged vessel's yard, from the center
or mast to the end.
Note: Ships are said to be yardarm and yardarm when so near
as to touch, or interlock yards.
From WordNet (r) 1.7 (wn)
yardarm
n : either end of the yard of a square-rigged ship
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