'Helenium autumnale' definitions:

Definition of 'Helenium autumnale'

From: WordNet
noun
North American perennial with bright yellow late summer flowers [syn: autumn sneezeweed, Helenium autumnale]

Definition of 'Helenium autumnale'

From: GCIDE
  • Sneezeweed \Sneeze"weed`\, n. (Bot.) A yellow-flowered composite plant (Helenium autumnale) the odor of which is said to cause sneezing. [1913 Webster]