On·o·ce·rin n.  Chem. A white crystalline waxy substance extracted from the root of the leguminous plant Ononis spinosa.
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  Cam·mock n.  Bot. A plant having long hard, crooked roots, the Ononis spinosa; -- called also rest-harrow. The Scandix Pecten-Veneris is also called cammock.
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  Ononis spinosa
       n : Eurasian plant having loose racemes of pink or purple
           flowers and spiny stems and tough roots [syn: restharrow,
            rest-harrow]