ˈwätviˌlīt noun
( -s )
Usage: usually capitalized
Etymology: German wattevillit, from Baron Oscar de Watteville, 19th century Frenchman + German -it -ite
: a mineral Na 2 Ca(SO 4 ) 2 .4H 2 O(?) that is a hydrous sulfate of sodium and calcium and occurs as aggregates of minute hairlike crystals