neoblast

noun

1. A large, undifferentiated cell of annelid worms that participate in regeneration of lost parts.

   “To trigger neoblast proliferation and differentation,^([sic]) two days head and tail regenerating animals were used for the preparation of the libraries.”

2. A crystal or mineral species in metamorphic rock, formed more recently, by recrystallization, than others in the same rock.

   “Based on insight from large neoblast growth in terrestrial settings, we suggest that the ca. 4.33 Ga neoblasts recently reported in lunar zircon may imply a major basin-forming event on the Moon at that time.”