One of the mysteries of the English language finally explained.
A free-swimming bivalve mollusc, the shell of which is typically white and has a rough, ribbed external surface.
- ‘The file shell, like the scallop, can move very rapidly by clapping its shells together.’
- ‘The crab was presumably going to try to break it open as soon as possible, but the file shell's acid secretions may have permitted a last-minute escape.’
- ‘A spiny file shell can use its foot to bounce up from the bottom and can swim, but file shells have no eyes.’
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