protonema

noun
pro·to·ne·ma | \ˌprō-tə-ˈnē-mə \
plural protonemata\ˌprō-tə-ˈnē-mə-tə, -ˈne- \

Definition of protonema 

: the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns

Other Words from protonema

protonemal \ˌprō-tə-ˈnē-məl \ adjective
protonematal \ˌprō-tə-ˈnē-mə-tᵊl, -ˈne- \ adjective

First Known Use of protonema

1857, in the meaning defined above

History and Etymology for protonema

New Latin protonemat-, protonema, from prot- + Greek nēma thread — more at nemat-

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The first known use of protonema was in 1857

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Britannica.com: Encyclopedia article about protonema

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