About this term
Source: Oxford University Press
Type of strong, substantial cloth originally made of hemp (Cannabis sativa, from which it takes its name) but more likely to be of a coarse flax or tightly woven linen; similar textiles of cotton or jute are also called canvas. A cloth type rather than a specific cloth, with varied practical applications, canvas is important as a material used for making painting supports. ‘Canvas’ has therefore come to mean not only the raw cloth but also a piece of fabric mounted on a stretching frame and prepared for use in painting or a finished painting, usually in oils, painted on a textile support.
From Grove Art Online