Kalmar "caoutchouc" kalma ce ta Faransanci wacce ke nufin roba na halitta, wanda yake wani abu ne mai ƙarfi da ƙarfi wanda aka samo daga latex na tsire-tsire masu zafi daban-daban, musamman itacen roba. Turanci daidai da "caoutchouc" shine "rubber".
