Pro-thalloid

prothallium

[proh-thal-ee-uhm]
noun, plural prothallia [proh-thal-ee-uh] .
1.
Botany. the gametophyte of ferns and related plants.
2.
the analogous rudimentary gametophyte of seed-bearing plants.

Origin:
1855–60; < Neo-Latin < Greek pro- pro-2 + thallíon, diminutive of thallós young shoot; see -ium

prothallial, prothallic, prothalline [proh-thal-een, -ahyn] , adjective
prothalloid, adjective
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