Simple past tense and past participle of fountain.(verb)
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Use "fountained" in a sentence
"To their inhabitants they offer fountained courtyards, gorgeous tile work, deep divans, shade, internal peace, and four symmetrical flower beds utterly cloistered from the outside world."
"Incredible arcs of crimson energy fountained into the body on the slab, the Bust Assembly spinning crazily."
"Blood fountained from the wound; Taro reeled, shocked."