fatty tuna; tuna belly
Refers to the fatty belly cut of tuna, prized in sushi and sashimi. Often contrasted with 赤身 (lean tuna).
At the sushi restaurant, I ordered one piece of fatty tuna.
Extra-fatty tuna belly is especially rich and delicious.
For pieces of nigiri sushi (まぐろ二貫).
Sushi pieces can be counted with 貫 in sushi shops; 切り is also used when referring to slices/servings.
Standard hiragana spelling; no kanji form exists.
Katakana spelling is common in menus and food contexts.
The origin is uncertain; possibly related to the onomatopoeic とろとろ (melting, soft), describing the texture of the fatty meat.