medical definition proliferative
proÂ·lifÂ·erÂ·ate. v. proÂ·lifÂ·erÂ·atÂ·ed, proÂ·lifÂ·erÂ·atÂ·ing, proÂ·lifÂ·erÂ·ates. v. intr. 1. To grow or multiply by rapidly producing new tissue, parts, cells, or offspring. 2. To increase or spread at a rapid rate: fears that nuclear weapons might proliferate. v. tr. To cause to grow or increase rapidly.