タマガイ
Meanings
1
moon snail; moon shell
usually written using kana alone
Refers to snails of the family Naticidae, known for their round shells.
I picked up a moon snail shell on the beach.
2
Akoya pearl oyster; Marten's pearl oyster
usually written using kana alone
Specifically Pinctada fucata martensii, the oyster used for Akoya pearls. Cross-referenced with 阿古屋貝.
See also: アコヤ貝
The Akoya pearl oyster is used in pearl farming.