The Collaborative International Dictionary of English v.0.48:

Hoy \Hoy\, n. [D. heu, or Flem. hui.] (Naut.)
   A small coaster vessel, usually sloop-rigged, used in
   conveying passengers and goods from place to place, or as a
   tender to larger vessels in port.
   [1913 Webster]

         The hoy went to London every week.       --Cowper.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hoy \Hoy\, interj. [D. hui. Cf. Ahoy.]
   Ho! Halloe! Stop!
   [1913 Webster]

WordNet (r) 3.0 (2006):

hoy
    n 1: a flatbottom boat for carrying heavy loads (especially on
         canals) [syn: barge, flatboat, hoy, lighter]