Definition of Roman wormwood in US English:

Roman wormwood

noun

  • 1An artemisia of Central and Eastern Europe, Artemisia pontica, formerly used medicinally.

  • 2North American common ragweed, Ambrosia artemisiifolia, with leaves resembling those of an artemisia.

Origin

Mid 16th century; earliest use found in William Turner (d. 1568), naturalist and religious controversialist.