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cytosine arabinoside cytosine ar·a·bin·o·side (ār'ə-bĭn'ə-sīd', ə-rāb'ə-nō-sīd')
A compound of arabinose and cytosine that inhibits both DNA synthesis and the proliferation of viruses that contain DNA, used as a chemotherapeutic agent. Also called cytarabine.