Kalmar "oroid" ko "oroide" tana nufin nau'in gwal mai kama da zinari a zahiri. Yawanci ana yin shi ta hanyar haɗa jan karfe, zinc, da nickel a wasu ma'auni don samar da wani abu mai wuya kuma ya fi tsayi fiye da zinariya tsantsa. Kalmar "oroid" ta fito ne daga kalmar Helenanci "oros," ma'ana "dutse," domin an fara gano gawar a yankuna masu tsaunuka.
