blastema
noun
blas·te·ma bla-ˈstē-mə 
plural blastemas or blastemata bla-ˈstē-mə-tə
: a mass of undifferentiated cells capable of growth and differentiation
blastemal
bla-ˈstē-məl
adjective or blastematic
ˌbla-stə-ˈma-tik
Example Sentences
Recent Examples on the Web Thanks to that cocktail, in 25 animals the tissue created a blastema — no nerve necessary. 
Amber Dance, Smithsonian Magazine, 31 Jan. 2020 What determines which cells migrate into a blastema, and which stay put? Amber Dance, Smithsonian Magazine, 31 Jan. 2020 The first phase of the Pentagon’s plan to regrow soldiers’ limbs is complete; scientists managed to turn human skin into the equivalent of a blastema — a mass of undifferentiated cells that can develop into new body parts. Noah Shachtman, WIRED, 25 Mar. 2009
Amber Dance, Smithsonian Magazine, 31 Jan. 2020 What determines which cells migrate into a blastema, and which stay put? Amber Dance, Smithsonian Magazine, 31 Jan. 2020 The first phase of the Pentagon’s plan to regrow soldiers’ limbs is complete; scientists managed to turn human skin into the equivalent of a blastema — a mass of undifferentiated cells that can develop into new body parts. Noah Shachtman, WIRED, 25 Mar. 2009 Word History
Etymology
borrowed from Greek blástēma "shoot, offshoot," from blastē-, variant stem of blastánein, aorist blasteîn "to bud, sprout, grow" + -ma, resultative noun suffix — more at -blast
First Known Use
circa 1823, in the meaning defined above
Medical Definition
blastema
noun
blas·te·ma bla-ˈstē-mə
plural blastemas also blastemata -mət-ə
: a mass of living substance capable of growth and differentiation