Ma'anar ƙamus na kalmar "rhizoid" wani tsari ne mai kama da tushen tushe ko ƙari wanda ke samuwa a cikin wasu tsire-tsire, fungi, da wasu algae. Rhizoids yawanci suna aiki don ɗaure kwayoyin halitta zuwa wani abu kuma don sha ruwa da abubuwan gina jiki daga muhallin da ke kewaye. Sau da yawa suna da bakin ciki da filamentous, kuma suna iya zama ko dai unicellular ko multicellular. Rhizoids ba tushen gaskiya bane, saboda ba su da ƙwararrun kyallen takarda da sifofi irin su jijiyar jijiyoyin jini da kuma tushen tushe.