small ball; bead; globule; small fruit or vegetable
Refers to a small round object, often used for beads, small fruits like cherry tomatoes, or small balls of food.
このネックレスには小さな小玉がたくさんついている。
This necklace has many small beads on it.
小玉のトマトをサラダに入れた。
I put small cherry tomatoes in the salad.
Edo-period small silver coin
Compound of 小 (small) and 玉 (ball, sphere). The reading こだま is a straightforward combination of the kun'yomi readings.