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
- 1 antheridium
- 2 archegonium
- 3 rhizoid
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Merriam-Webster unabridged
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