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lainefrondi ristsirge, mis näitab laine levimise suunda
луч волны . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%BB%D1%83%D1%87%20%D0%B2%D0%BE%D0%BB%D0%BD%D1%8B/1/rus (21.06.2026)
