a. [f. BOAT v. or sb. + -ABLE: app. first in U.S.] Navigable by boat.

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1683.  Penn, Descr. Pennsylv., Wks. 1782, IV. 315. The Schuylkill being an hundred miles boatable above the Jules.

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1796.  Morse, Amer. Geog., I. 536. The boatable waters of the Allegany.

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1807.  Vancouver, Agric. Devon (1813), 383. Where the tidal waters flow, and are always boatable.

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1864.  Marsh, Man & Nat., 420. A boatable channel.

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