ナイアスalso: ナーイアスMeanings1nounNaiad; water nymphA type of nymph in Greek mythology associated with fresh water. Cross-referenced with ナイアード, which is a related term.from Greek NaiasSee also: ナイアードギリシャ神しん話わでは、ナイアスは泉いずみや川かわに住すむ精せい霊れいです。In Greek mythology, Naiads are spirits that live in springs and rivers.