so·​ma·​to·​blast | \ˈsōmətəˌblast\

Definition of somatoblast 

1a : a cleavage cell of an annelid worm that is the precursor of most of the trunk ectoderm, the nervous system, and the nephridia

b : cleavage cells descended from the primary somatoblast cell of an annelid

2 : the outer layer of cells of the nematogen of a dicyemid mesozoan

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History and Etymology for somatoblast

somat- + -blast

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