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1. (Science: zoology) A very large oceanic fish (xiphias gladius), the only representative of the family Xiphiidae. It is highly valued as a food fish. The bones of the upper jaw are consolidated, and form a long, rigid, swordlike beak; the dorsal fin is high and without distinct spines; the ventral fins are absent. The adult is destitute of teeth. It becomes sixteen feet or more long. The ger pike.

The cutlass fish.

2. (Science: astronomy) A southern constellation. See dorado.

(Science: zoology) Swordfish sucker, a remora (Remora brachyptera) which attaches itself to the swordfish.