- (in mosses, ferns, etc.) one of the rootlike filaments by which the plant is attached to the substratum.
Origin of rhizoid
1855–60; rhiz- + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rhizoid
Rhizoid: Of an irregular, branched, root-like character (Fig. 142, b).The Elements of Bacteriological Technique
John William Henry Eyre
- any of various slender hairlike structures that function as roots in the gametophyte generation of mosses, ferns, and related plants
Word Origin and History for rhizoid
Online Etymology Dictionary, © 2010 Douglas Harper
- Having irregular branching. Used of a form of bacterial growth.
- A slender rootlike filament by which mosses, liverworts, and fern gametophytes attach to the substratum and absorb nourishment.
- A rootlike extension of the thallus of a fungus.
- A slender, rootlike filament by which mosses, liverworts, and the gametophytes of ferns attach themselves to the material in which they grow.
- A branching, rootlike extension by which algae and fungi absorb water and nutrients.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.