Catalyzes hyaluronan degradation into small fragments that are endocytosed and degraded in lysosomes by HYAL1 and exoglycosidases (PubMed:9712871). Essential for the breakdown of extracellular matrix hyaluronan (PubMed:28081210). {ECO:0000269|PubMed:28081210, ECO:0000269|PubMed:9712871}. This is the function of Ensembl gene identifier ENSG00000068001 (HYAL2, hyaluronidase 2).