Illustration of prothallus
- 1 antheridium
- 2 archegonium
- 3 rhizoid
prothallus
noun
pro·thal·lus (ˌ)prō-ˈtha-ləs 
1
: the gametophyte of a pteridophyte (such as a fern) that is typically a small flat green thallus attached to the soil by rhizoids
2
: a greatly reduced structure of a seed plant corresponding to the pteridophyte prothallus
Word History
Etymology
New Latin
First Known Use
1854, in the meaning defined at sense 1
- nondogmatic
- nondogmatically
- nondomestic
- nondomestics
- nondominant
- nondominants
- nondormant
- nondramatic
- nondramatically
- nondrinker
- nondrinkers
- nondrinking
- nondriver
- nondrivers
- nondrug
- nondrying oil
- nondryinger
- nondryingest
- nondualism
- nondurability
- nondurable
- nondurables
- none
- none but
- none of one's beeswax