Main Entry: or·ga·niz·er

Variant(s): also British or·ga·nis·er \-ˌnī-zər\

Function: noun

1 : one that organizes
2 : a region of a developing embryo (as the chordamesoderm of the dorsal lip of the vertebrate blastopore) or a substance produced by such a region that is capable of inducing a specific type of development in undifferentiated tissue—called also inductor