Definition of anchialine
: having an underground connection to a larger tidal body (such as the sea) but no surface connection
anchialine pools Located on an island in The Abacos, the fauna in this seawater-flooded anchialine cave is among the richest and most diverse in the world. — Seed, June/July 2006
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Merriam-Webster unabridged
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Time Traveler for anchialine
The first known use of anchialine was in 1984
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