Simple past tense and past participle of discard.(verb)
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Use "discarded" in a sentence
"All tiles must be "_punged_" or "_chowed_" _as they are discarded_; for a tile discarded by a player and allowed to remain in discard until the next player discards, becomes "dead" and _cannot be_ touched during the rest of the game."
"That something, I decided, would be to paint actual pixels (in representative square strokes) on the canvas, so that at the very least all residual creativity that might have been discarded from the web process would get a chance of being reused."
"Recycled materials are also acceptable, as garbage and debris pose a threat to coastal wildlife that ingest or otherwise become entangled in discarded trash and lost fishing gear."