Goat's beard \Goat's beard\, goatsbeard \goatsbeard\n. (Bot.), A weedy European annual with yellow flowers, of the genus {Tragopogon}; -- so named from the long silky beard of the seeds. One species is the {salsify} or {oyster plant}; it is naturalized in US. Syn: meadow salsify, shepherd's clock, {Tragopogon pratensis}. [1913 Webster + WordNet 1.5]