noun, plural pro·thal·li [proh-thal-ahy]. /proʊˈθæl aɪ/. Botany.
BEAT THE DOLDRUMS WITH THIS WORD OF THE DAY QUIZ!
Words nearby prothallus
Example sentences from the Web for prothallus
The prothallus is a small underground body destitute of chlorophyll.
The prothallus is exceedingly small, being little more than a group of cells forming an antheridium.
Prothallus green, formed upon the ground, often variously lobed, usually dicious.
In the case of L. inundatum the length of time which elapses between the coming of the prothallus is nothing like so great.
As a rule, too, in the prothallus only one of the archegonia shows any further signs of development.