American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
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Elsewhere on the web
Some seeds, such as ageratum, alyssum, impatiens, petunias, and snapdragons, should not be covered at all because they need light in order to germinate.
(One of his first words was 'ageratum,' a small bluish-purple flower.)— Southern Maryland Community Forums
This was money enough to buy seeds of ageratum, zinnia, dwarf nasturtium, California poppy and verbena besides some others.— The Library of Work and Play: Gardening and Farming.
"Oh yes, I shall," she replied in her pleasant way After we were left alone that Saturday morning (Hatty writes) Mrs. Prentiss gathered quite a bunch of the wild ageratum, and then dug up the roots of three wild clematis vines with her scissors.— The Life and Letters of Elizabeth Prentiss
The soft blue tufts of the ageratum were on each side continually.— Bonaventure A Prose Pastoral of Acadian Louisiana

American Heritage Dictionary (1)
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