HETEROCYST

Etymology

Noun

heterocyst (plural heterocysts)

Alternative form of heterocyte

Source: Wiktionary

Het"er*o*cyst, n. Etym: [Hetero- + cyst.] (Bot.)

Definition: A cell larger than the others, and of different appearance, occurring in certain algæ related to nostoc.

Source: Webster’s Unabridged Dictionary 1913 Edition