Antineoplastic Meaning of Antineoplastic Blocking the formation of neoplasms (growths that may become cancer). Also See: Adenosis Acute radiation sickness Anti-idiotype vaccine Antisense Oligonucleotide Iherapy Amoxicillin-clavulanate potassium Activate Acolbifene hydrochloride Antipsychotic agent Attenuated familial adenomatous polyposis Antiemetic