also: ちゅうとろ
medium-fatty tuna
Refers to the belly cut of tuna with a moderate fat content, between lean (赤身) and fatty (大トロ). Common in sushi contexts.
Three pieces of medium-fatty tuna nigiri, please.
Hiragana variant, less common but still seen.
Compound of 中 (medium) and トロ (fatty tuna belly). トロ likely derives from とろり (thick, syrupy), referring to the melting texture of the fatty meat.