かいわれ大だい根こん

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Meanings

1

noun

radish sprouts; daikon sprouts

Refers to the young sprouts of daikon radish, commonly used in salads and as a garnish. Often sold in supermarkets as カイワレ大根.

かいわれ大だい根こん
Common mixed kanji-kana spelling.
貝かい割われ大だい根こん
Full kanji spelling, less common but still seen.
カイワレ大だい根こん
Katakana spelling often used in shops or packaging.
穎割かいわれ大だい根こん
rarely-used kanji form
Rare kanji form using 穎; not commonly encountered.

もやし
もやし are bean sprouts (usually mung bean or soybean), while かいわれ大根 are specifically daikon radish sprouts with a different shape and sharper taste.
スプラウト
スプラウト is a broader loanword for various edible sprouts, whereas かいわれ大根 refers specifically to daikon radish sprouts.

From 貝割れ (kaiware, 'split shell'), referring to the shape of the cotyledons resembling a split shell, and 大根 (daikon, 'daikon radish').