Here you will find one or more explanations in English for the word Chesstree.
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Chesstree
Chesstree Chess"tree`, n. [Cf. F. chassis a framework of
carpentry.] (Naut.)
A piece of oak bolted perpendicularly on the side of a
vessel, to aid in drawing down and securing the clew of the
mainsail.
Meaning of Chesstree from wikipedia