Search and compare thousands of words and phrases in British Sign Language (BSL). The largest collection online.
How to sign: predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton
Similiar / Same: blue-green algae
Categories: eubacteria, eubacterium, true bacteria
Within this category: nostoc, trichodesmium
