資料來源 : Webster's Revised Unabridged Dictionary (1913)

Ageratum \A*ger"a*tum\, n. [NL., fr. Gr. ? a sort of plant; 'a
   priv. + ? old age.] (Bot.)
   A genus of plants, one species of which ({A. Mexicanum}) has
   lavender-blue flowers in dense clusters.