• WordNet 3.6
    • v roughcast hew roughly, without finishing the surface "rough-hew stone or timber"
    • v roughcast apply roughcast to "roughcast a wall"
    • v roughcast shape roughly
    • n roughcast a rough preliminary model
    • n roughcast a coarse plaster for the surface of external walls
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Webster's Revised Unabridged Dictionary
    • Roughcast A kind of plastering made of lime, with a mixture of shells or pebbles, used for covering buildings.
    • Roughcast A rude model; the rudimentary, unfinished form of a thing.
    • Roughcast To form in its first rudiments, without revision, correction, or polish.
    • Roughcast To mold without nicety or elegance; to form with asperities and inequalities.
    • Roughcast To plaster with a mixture of lime and shells or pebbles; as, to roughcast a building.
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Century Dictionary and Cyclopedia
    • n roughcast A kind of plastering for an external wall, composed of an almost fluid mixture of clean gravel and lime, dashed on the wall, to which it adheres.
    • roughcast To form roughly or crudely; compose or shape in a rudimental manner; block out in the rough: as, to rough-cast a model; to rough-cast a story or an essay.
    • roughcast To cover with a coarse semi-fluid plaster by casting or throwing it: as, to rough-cast a wall. See the noun.
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In literature:

The wall between the garden and hemp-field was roughcast with lime and pebbles.
"The Devil's Pool" by George Sand