Nihoner
表層形
バイ菌
バイキン
名詞

バイ菌 (バイキン)

Baikin · ばいきん — germ, germs, bacteria, bug; something dirty or harmful, vermin

Other ways to say “germ” in Japanese →

バイ菌 in rōmaji: baikin.

名詞 普通名詞 一般 *
📝 黴菌 🔤 * 📐 *
Updated: 2026年9月9日
📖 Grammar Information
表層形 (Surface)
バイ菌
見出し語 (Lemma)
黴菌
読み (Reading)
バイキン
品詞 (POS)
名詞・普通名詞・一般・*
活用型 (Conj. Type)
*
活用形 (Conj. Form)
*
表記 (Orthography)
バイ菌
読み・基本形
バイキン
表記・基本形
バイ菌
見出し語の読み
バイキン
How it's used

Everyday casual speech or writing to refer to germs or dirt, often when warning children or describing contamination.

手を洗わないとバイ菌がつくよ。
Te o arawanai to baikin ga tsuku yo.
You'll get germs on your hands if you don't wash them.

この食べ物、バイ菌がいるかもしれない。
Kono tabemono, baikin ga iru kamo shirenai.
This food might have germs in it.

⚖️ Commonly confused with '細菌' (さいきん), which is more scientific and neutral, while 'バイ菌' is informal and often implies harmful dirt.

💡 English Meaning

バイ菌 means “germ, germs, bacteria, bug; something dirty or harmful, vermin” — full definition & examples →

⭐ Dictionary Form

黴菌 (カビキン) — main entry →

🔗 Other Forms of バイ菌
🃏 Flashcard — Test Yourself
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バイ菌
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Reading & Info
バイキン
Lemma: 黴菌
名詞普通名詞一般*
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💡
Did you know · 名詞
名詞 (nouns) are the backbone of Japanese sentences. They can be combined with particles like が, を, に, で to indicate grammatical role.
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❓ About this entry
What is the difference between surface form and lemma? ▼
The surface form (バイ菌) is the exact text as it appeared in the corpus — it may be conjugated or inflected. The lemma (黴菌) is the dictionary base form. For example, 食べた (surface) has the lemma 食べる.
What does the reading (pron) field mean? ▼
The reading shows the pronunciation in hiragana or katakana as recorded by UniDic. For kanji entries this is the standard reading of this specific surface form — which may differ from other readings of the same kanji.
What is UniDic? ▼
UniDic is a comprehensive Japanese lexicon developed by the National Institute for Japanese Language and Linguistics (NINJAL). It provides detailed morphological information for modern Japanese words, used in NLP tools like MeCab.
How do I save this entry? ▼
Click the ★ save button in the word card above (you need to be logged in). Saved entries appear in your personal Saved Dictionary page for quick review later.