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

• Lexulous
• Wordscraper
• Wordosaur

adj. Capable of developing into only one type of cell or tissue.

adj. Having the capacity to develop into only one type of cell or tissue

adj. Having a single idempotent element

Powerful or effective in only one way or direction.

"EPO stimulates the production of mature erythrocytes by mediating the survival, proliferation and differentiation of unipotent erythroid progenitor cells, called erythroblasts."

idempotent    nullipotent    nilpotent