Origin of rhizoidrhiz(o)- + -oid
any of the rootlike filaments in a moss, fern, etc. that attach the plant to the substratum
A slender rootlike filament that grows from an alga, a fungus, or the gametophyte of a moss, liverwort, or fern, used for attachment and nourishment.
- rhi′zoid′ rhi·zoi′dal