永冻土 yǒngdòngtǔ permafrost Origin Definitions Defs Strokes Stroke Words Sentences Sents 永 yǒng adverb perpetual long; lasting; perpetual; permanent冻土 凍土 dòngtǔ noun frozen earth frozen earth; permafrost; tundra; soil or loose rock in high altitudes or high latitudes where moisture has frozen