noun
radish sprout
Specifically refers to the young sprouts of daikon radish, often used in salads and as a garnish. The name comes from the shell-like split cotyledons.
サラダに貝割りをのせると、彩りがよくなる。
Adding radish sprouts to a salad makes it more colorful.
貝割りは発芽してすぐに収穫できる。
Radish sprouts can be harvested soon after germination.
From 貝 (kai, 'shell') + 割り (wari, 'split'), referring to the appearance of the split cotyledons resembling a shell. The ateji spellings 卵割り and 穎割り use characters with similar readings.