different between jailyard vs sailyard

English

jail +? yard

jailyard (plural jailyards)

sail +? yard

sailyard (plural sailyards)

(nautical) A yard to which the sails of a ship are bent.
(obsolete) One of the structural arms of a windmill to which the vanes or sails are attached.
(entomology, obsolete) An antenna of an insect.

John A. Simpson and Edward S. C. Weiner, editors (1989) , “sailyard”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, ?ISBN

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