Definition of heterocyst in English:

heterocyst

Syllabification: het·er·o·cyst
Pronunciation: /ˈhetərəˌsist/

Entry from US English dictionary

noun

A large, transparent, thick-walled cell found in the filaments of certain blue-green algae and in certain fungi.

Definition of heterocyst in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music