Noun has 2 senses

• hop clover(n = noun.plant) black medick, medicago lupulina, nonesuch clover, yellow trefoil - prostrate European herb with small yellow flowers and curved black pods; naturalized in North America;


• hop clover(n = noun.plant) lesser yellow trefoil, shamrock, trifolium dubium - clover native to Ireland with yellowish flowers; often considered the true or original shamrock;