ˈfläzə(r) noun
( -s )
Etymology: German, vein in wood or rock, probably dialect modification of flader vein in wood, veined wood, maple tree, from Middle High German vlader vein in wood, veined wood; perhaps akin to Greek platys flat, broad — more at place
: an irregular usually streaked lens of granular texture found in a micaceous interstitial mass of rock and produced by shearing and pressure during metamorphism