Petrified Forest National Park noun a national park in E Arizona: buried tree trunks turned to stone by the action of mineral-laden water. 147 sq. mi. (381 sq. km). Liberaldictionary.com What It Really Means to Call Someone "Crude" Can You Translate These Famous Phrases From Emoji? These Are the Longest Words in English These Are the Saddest Phrases in English Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019