The Collaborative International Dictionary of English v.0.48:

Hare \Hare\, n. [AS. hara; akin to D. haas, G. hase, OHG. haso,
   Dan. & Sw. hare, Icel. h[=e]ri, Skr. [,c]a[,c]a. [root]226.]
   [1913 Webster]
   1. (Zool.) A rodent of the genus Lepus, having long hind
      legs, a short tail, and a divided upper lip. It is a timid
      animal, moves swiftly by leaps, and is remarkable for its
      fecundity.
      [1913 Webster]

   Note: The species of hares are numerous. The common European
         hare is Lepus timidus. The northern or varying hare
         of America (Lepus Americanus), and the prairie hare
         (Lepus campestris), turn white in winter. In America,
         the various species of hares are commonly called
         rabbits.
         [1913 Webster]

   2. (Astron.) A small constellation situated south of and
      under the foot of Orion; Lepus.
      [1913 Webster]

   Hare and hounds, a game played by men and boys, two, called
      hares, having a few minutes' start, and scattering bits of
      paper to indicate their course, being chased by the
      others, called the hounds, through a wide circuit.

   Hare kangaroo (Zool.), a small Australian kangaroo
      (Lagorchestes Leporoides), resembling the hare in size
      and color,

   Hare's lettuce (Bot.), a plant of the genus Sonchus, or
      sow thistle; -- so called because hares are said to eat it
      when fainting with heat. --Dr. Prior.

   Jumping hare. (Zool.) See under Jumping.

   Little chief hare, or Crying hare. (Zool.) See Chief
      hare.

   Sea hare. (Zool.) See Aplysia.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lettuce \Let"tuce\ (l[e^]t"t[i^]s), n. [OE. letuce, prob.
   through Old French from some Late Latin derivative of L.
   lactuca lettuce, which, according to Varro, is fr. lac,
   lactis, milk, on account of the milky white juice which flows
   from it when it is cut: cf. F. laitue. Cf. Lacteal,
   Lactucic.]
   1. (Bot.) A composite plant of the genus Lactuca (Lactuca
      sativa), the leaves of which are used as salad. Plants of
      this genus yield a milky juice, from which lactucarium is
      obtained. The commonest wild lettuce of the United States
      is Lactuca Canadensis.
      [1913 Webster]

   2. United States currency; dollar bills; greenbacks. [slang]
      [PJC]

   Hare's lettuce, Lamb's lettuce. See under Hare, and
      Lamb.

   Lettuce opium. See Lactucarium.

   Sea lettuce, certain papery green seaweeds of the genus
      Ulva.
      [1913 Webster]