Mosaic "mosaical work" noun Obsolete. = mosaic work .
Late 16th century; earliest use found in Philip Sidney (1554–1586), author and courtier. From mosaic + -al.
Mid 16th century; earliest use found in Ninian Winzet (1518–1592), abbot in Regensburg and religious controversialist. From post-classical Latin Mosaicus, Moysaicus Mosaic + -al.