galactosidase
noun
ga·lac·to·si·dase gə-ˌlak-ˈtō-sə-ˌdās 
-zə-ˌdāz
: an enzyme (such as lactase) that hydrolyzes a galactoside
Example Sentences
Recent Examples on the Web Or test your tolerance for small portions of less-gassy legumes like lentils and chickpeas with the aid of a bean-fiber-busting enzyme supplement called alpha galactosidase. 
SELF, 30 Nov. 2018
SELF, 30 Nov. 2018 Word History
Etymology
galactoside + -ase (perhaps after French galactosidase)
First Known Use
1914, in the meaning defined above
Medical Definition
galactosidase
noun
ga·lac·to·si·dase gə-ˌlak-ˈtō-sə-ˌdās, -zə-ˌdāz
: an enzyme (as lactase) that hydrolyzes a galactoside