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The Collaborative International Dictionary
pavais

Pavise \Pa*vise\, n. [OF. pavaix, F. pavois; cf. It. pavese, LL. pavense; perh. named from Pavia in Italy.] (Mil. Antiq.) A large shield covering the whole body, carried by a pavisor, who sometimes screened also an archer with it. [Written also pavais, pavese, and pavesse.]
--Fairholt.

Wiktionary
pavais

n. (context military historical English) A very large shield covering a soldier from head to foot, often with a projecting ridge running vertically down the center.