[from cannabis, hemp].
A cloth made of hemp, and used for the sails of ships. It is purchased in bolts, and numbered from 1 to 8, rarely to 9 and 10. Number 1 being the coarsest and strongest, is used for the lower sails, as fore-sail and main-sail in large ships. When a vessel is in motion by means of her sails she is said to be under canvas.