noun
Japanese geoduck
A species of large saltwater clam native to Japan, Panopea japonica. Often used in sushi and sashimi.
ナミガイはミル貝の一種で、寿司ネタとして人気がある。
The Japanese geoduck is a type of mirugai clam and is popular as a sushi topping.
ミルガイ (mirugai) is a broader term often used in sushi contexts for geoduck clams, while ナミガイ specifically refers to Panopea japonica.
The name likely derives from 波 (nami, 'wave') + 貝 (kai, 'shellfish'), but the exact origin is uncertain.