aceraceae - Aceraceae (Lat. acer, maple); aceraceae - Large family of trees and shrubs whose watery sap in some species yields sugar. The leaves are lobed, or divided into two rows of leaflets. The flowers are sometimes without petals, massed in corymbs or racemes, the two-lobed carpels developing into the double keys or samaras familiar in the sycamore. They are natives of most temperate countries. The timber though light is useful, and from the bark brown and yellow dyes have been obtained. See Maple.