陆海空 lùhǎikōng land, sea, and air Definitions Defs Origin Strokes Stroke Words Sentences Sents 陆 陸 lù nounverb land (bound form) land as opposed to water or air; land routes海 hǎi noun sea ocean or sea; large bodies of water including salt lakes or large inland lakes空 kōng noun sky (bound form) the sky; outer space; the air