n.
Pronunciation: ' he-t ə -r ō - ˌ sist
Function: noun
Date: 1872
: a large transparent thick-walled cell that is found in the filaments of some cyanobacteria and is the site of nitrogen fixation
– het · ero · cys · tous \ ˌ he-t ə -r ō - ' sis-t ə s \ adjective