casement

casement n

med. L. casamentum; in It. casamento, a building or house-frame.

1. Tabernacle; container; houseboat; large water craft; [fig.] frame; window sill; [kenning: floating casement] Noah's Ark (see Genesis 8); [historical] Dutton called Webster's 1828 dictionary “Noah's Ark” because it contained “unclean” Americanisms as well as standard British English.