Kumi logo
    Kumi

    Learn Japanese. Where understanding folds into fluency.

    Dictionary

    KanjiKanji vocabularyKana vocabularyKanaRadicalsGrammarJLPT N5

    Learn

    GuidesStart where you areWhat is KMT?RoadmapFAQ

    Connect

    EmailDiscordInstagramThreadsTikTokYouTubeLinkedInBlueskyX

    Newsletter

    Start learning free →

    Free forever tier. No card required.

    © 2026 Kumiai Inc. All rights reserved.

    AboutFAQContactStatusPrivacyTermsAttributions
    Dictionary
    1. Dictionary
    2. Kanji Vocab
    3. 紫外線

    紫外線

    紫し外がい線せん

    ultraviolet rays

    KMT7News #12+1NounScience & MathWeather & GeographyKanji Vocab32 strokes

    しがいせん

    Noun

    1.
    ultraviolet rays, ultraviolet radiation, UV radiation
    physics

    Stroke 0 / 32

    Speed1.0x

    紫し外がい線せんは肌はだに悪わるい。

    UV rays are bad for the skin.

    KMT4Daily LifeMedicine & Health
    夏なつは紫し外がい線せんが強つよいので、日ひ焼やけ止どめを塗ぬるべきだ。

    UV rays are strong in summer, so you should apply sunscreen.

    KMT7Weather & GeographyDaily Life
    今きょ日うは紫し外がい線せん指し数すうが高たかいので、外がい出しゅつ時じは注ちゅう意いが必ひつ要ようだ。

    The UV index is high today, so caution is needed when going outside.

    KMT7Weather & GeographyDaily Life
    オゾン層そうは地ち球きゅうを有ゆう害がいな紫し外がい線せんから守まもっている。

    The ozone layer protects the Earth from harmful UV radiation.

    KMT7Science & MathNature & Environment
    紫し外がい線せんは、殺さっ菌きんや消しょう毒どくにも利り用ようされている。

    UV rays are also used for sterilization and disinfection.

    KMT8Science & MathMedicine & Health

    Kanji that make up this word

    紫
    むらさき…(3)
    purple・violet
    外
    そと・ほか・はず.す・はず.れる・と-…(5)
    outside
    線
    すじ…(1)
    line・track
    Kumi logo

    Track your mastery

    Kumi's KMT system tracks your mastery across kanji, vocabulary, grammar, and reading. Create a free account to use it on 220,000+ concepts.

    Related concepts for this entry

    Used in vocabulary

    • 紫
    • 外
    • 線

    Explore more

    Kanji Vocab dictionary›Browse all entries›