agate
agate1
(ˈæɡɪt
) noun
1 an impure microcrystalline form of quartz consisting of a variegated, usually banded chalcedony, used as a gemstone and in making pestles and mortars, burnishers, and polishers. Formula: SiO2
2 a playing marble of this quartz or resembling it
3 Also called: ruby printing, US and Canadian (formerly) a size of printer's type approximately equal to 51⁄2 point
[C16: via French from Latin achātēs, from Greek akhatēs]
