| ̷ ̷ ̷ ̷ at hydro- + noun
Etymology: hydr- + grossularite
: a mineral Ca 3 Al 2 (SiO 4 ) 3- x (OH) 4 x , consisting of silicate of calcium and aluminum in which silicon is partly replaced by hydrogen with x near 1/2 : one of the hydrogarnets intermediate between grossularite ( x .0) and hibschite ( x .1)