What is "wharf boat"

Wharf \Wharf\, n.; pl. Wharfsor Wharves. [AS. hwerf, hwearf, a returning, a change, from hweorfan to turn, turn about, go about; akin to D. werf a wharf, G. werft, Sw. varf a shipbuilder's yard, Dan. verft wharf, dockyard, G. werben to enlist, to engage, woo, OHG. werban to turn about, go about, be active or occupied, Icel. hverfa to turn, Goth. hwa['i]rban, hwarb[=o]n, to walk. Cf. Whirl.]

1. A structure or platform of timber, masonry, iron, earth, or other material, built on the shore of a harbor, river, canal, or the like, and usually extending from the shore to deep water, so that vessels may lie close alongside to receive and discharge cargo, passengers, etc.; a quay; a pier.

   Commerce pushes its wharves into the sea.
   --Bancroft.

   Out upon the wharfs they came, Knight and burgher, lord and dame.
   --Tennyson.

   Note: The this word is generally written wharves in the United States, and wharfs in England; but many recent English writers use wharves.

2. [AS. hwearf.] The bank of a river, or the shore of the sea. [Obs.] ``The fat weed that roots itself in ease on Lethe wharf.'' --Shak. Wharf boat, a kind of boat moored at the bank of a river, and used for a wharf, in places where the height of the water is so variable that a fixed wharf would be useless. [U. S.] --Bartlett. Wharf rat. (Zo["o]l.)

   1. The common brown rat.

   2. A neglected boy who lives around the wharfs. [Slang]