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Webster Dictionary (0.00 / 0 votes) Rate this definition: Amphi- a prefix in words of Greek origin, signifying both, of both kinds, on both sides, about, around
The lancelets â also known as amphioxi (singular, amphioxus) consist of about 32 species of fish-like marine chordates in the order Amphioxiformes. They are distributed in shallow and coastal temperate (as far north as Norway), subtropical and tropical seas around the world, usually found half-buried in sand.