spon·gi·o·blast 
(spŭnjē-ə-blăst′)
(spŭnjē-ə-blăst′)n.
Any of the embryonic epithelial cells that give rise to the neuroglia.
[Latin spongia, sponge; see SPONGE + -BLAST.]
- undeliverable
- undeliverably
- undemonstrative
- undemonstratively
- undeniable
- undeniably
- undependability
- undependable
- under
- underachieve
- underachievement
- underachiever
- under a cloud
- underact
- underactive
- underactivity
- underage
- underage
- underaged
- underarm
- underbanked
- underbelly
- under belt
- underbid
- under-bid