One of the mysteries of the English language finally explained.
1A long slender fish found chiefly in warmer seas, which lives inside the shells of bivalve molluscs or the body cavities of sea cucumbers and other invertebrates.
- ‘One creature that takes advantage of the movement of water to the respiratory trees in the sea cucumber is the pearlfish, or cucumber fish (Carapidae).’
- ‘Cardinalfishes and pearlfishes live inside large gastropods and mollusks.’
2A small Argentinian killifish, popular in aquaria.
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