( n. )
A rounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay.
( n. )
A rounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012