B variant GM2 gangliosidosisnoun [ U ]
uk/ˌbiː veə.ri.ənt dʒiː.emˌtuː ˌɡæŋ.ɡli.əʊ.sɪˈdəʊ.sɪs/us/ˌbi ver.i.ənt dʒiː.emˌtuː ˌɡæŋ.ɡli.oʊ.sɪˈdoʊ.sɪs/also Tay-Sachs disease, abbreviation TD specializeda genetic disease in which the body is unable to get rid of a fatty substance called ganglioside so that it builds up in the brain. This causes the nerves to stop working properly and eventually leads to death, usually before the age of three