noun
sashimi knife; yanagiba knife
A long, thin, single-edged knife used primarily for slicing raw fish for sashimi. The name comes from its willow-leaf shape.
板前は柳刃包丁で刺身を美しく切った。
The chef sliced the sashimi beautifully with a yanagiba knife.
From 柳 (yanagi, 'willow') + 刃 (ba, 'blade') + 包丁 (hōchō, 'kitchen knife'), referring to the long, slender, willow-leaf-shaped blade.