• WordNet 3.6
    • n Glaucium herbs of Europe and North Africa and Asia: horned poppy
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Century Dictionary and Cyclopedia
    • n glaucium A genus of papaveraceous herbs, with poppy-like flowers, glaucous foliage, and an acrid copper-colored juice. There are 5 or 6 species, natives of Europe, of which G. luteum, the yellow horn-poppy, is sparingly naturalized in the United States. They are sometimes cultivated for ornament.
    • n glaucium A genus of ducks, of the subfamily Fuligulinæ; the garrots: now usually referred to Clangula. Brisson, 1760. Also Glaucion.
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In literature:

In dry watercourses Cytisus is common, with a host of small Cruciferae, Boragineae, and Compositae; Papaveraceae are very common with Glaucium.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
I choose also to call a poppy, what the botanists have called "glaucous thing," (glaucium).
"Proserpina, Volume 1" by John Ruskin
"The Practical Garden-Book" by C. E. Hunn
Fruit a dry 1-celled pod (in the Poppy imperfectly many-celled, in Glaucium 2-celled).
"The Manual of the Botany of the Northern United States" by Asa Gray