Ma'anar ƙamus na "lu'u-lu'u" ƙarami ne, zagaye, yawanci farar bead da aka yi daga harsashi na ciki na wasu mollusks, musamman kawa, kuma ana amfani dashi azaman kayan ado a kayan ado da tufafi. Kalmar "iri" tana nufin ƙaramin girman lu'u-lu'u, wanda yawanci bai wuce 2mm a diamita ba. Ana amfani da lu'u-lu'u iri-iri don ƙawata ƙawaye, ƙira, kamar waɗanda aka samo a cikin kayan ado na zamani ko na zamani.