Adarce
(n.)
A saltish concretion on reeds and grass in marshy grounds in Galatia. It is soft and porous, and was formerly used for cleansing the skin from freckles and tetters, and also in leprosy.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
adarce
N F
salty deposit/effolescence on reeds; froth on sedge forming spongy growth