Definition of goat's thorn in English:

goat's thorn

noun

  • Any of several low-growing, spiny shrubs of the genus Astragalus (family Fabaceae), of northern Eurasia and the Middle East, some of which yield tragacanth, especially A. gummifer and A. tragacantha.

Origin

Late 16th century; earliest use found in John Gerard (c1545–1612), herbalist.