This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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adj. of or pertaining to proliferation, especially of cells

adj. proliferating; tending to proliferate

Reproductive; budding or sprouting into new similar forms.

"This thickening of the uterine lining is called the proliferative phase of the menstrual cycle, and it can vary in length from six to twenty days."

proliferational   

pigmentary    non-obese    laryngotracheal    preneoplastic    subcortical