nesidioblast
/nɪˈsɪdɪə(ʊ)ˌblast/ /nɪˈsɪdɪə(ʊ)ˌblɑːst/Histology and Physiology
noun
An immature precursor of the insulin-producing cell of the islets of Langerhans.
Origin
1930s. From ancient Greek νησίδιον islet (from νῆσος island, of unknown origin + -ίδιον) + -blast.