Term: human t-cell leukemia virus-1: retrovirus causing T-cell leukemia
Broader: retrovirus: any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | Unrelated: man-at-arms: a heavily armed and mounted soldier in medieval times