¦āchˌtē(ˌ)el¦vē noun
( -s )
Etymology: h uman T -cell l eukemia v irus
: any of several retroviruses that include one associated with adult T-cell leukemia and a progressive paralyzing myelopathy and that formerly included the original strain of the AIDS virus — often used with a number or Roman numeral to indicate the type; called also human T-cell leukemia virus