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The Collaborative International Dictionary
Chesses

Chesses \Chess"es\, n. pl. [Cf. F. chassis a framework of carpenty.] (Mil.) The platforms, consisting of two or more planks doweled together, for the flooring of a temporary military bridge.
--Wilhelm.

Note: A singular, chess, is sometimes used. ``Each chess consists of three planks.''
--Farrow.

Wiktionary
chesses

n. (plural of chess English)