Etymology
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rhizoid (adj.)

"root-like, resembling a root," 1858, from Greek rhiza "root," literal and figurative (see rhizo-) + -oid. As a noun in botany, "organ resembling a root on the underside of some plants," from 1875. Related: Rhizoidal; rhizoideous.

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Definitions of rhizoid

rhizoid (n.)
any of various slender filaments that function as roots in mosses and ferns and fungi etc;
From wordnet.princeton.edu