The Collaborative International Dictionary of English v.0.48:

Sire \Sire\, v. t. [imp. & p. p. Sired; p. pr. & vb. n.
   Siring.]
   To beget; to procreate; -- used of beasts, and especially of
   stallions.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sire \Sire\, n. [F. sire, originally, an older person. See
   Sir.]
   1. A lord, master, or other person in authority. See Sir.
      [Obs.]
      [1913 Webster]

            Pain and distress, sickness and ire,
            And melancholy that angry sire,
            Be of her palace senators.            --Rom. of R.
      [1913 Webster]

   2. A tittle of respect formerly used in speaking to elders
      and superiors, but now only in addressing a sovereign.
      [1913 Webster]

   3. A father; the head of a family; the husband.
      [1913 Webster]

            Jankin thet was our sire [i.e., husband]. --Chaucer.
      [1913 Webster]

            And raise his issue, like a loving sire. --Shak.
      [1913 Webster]

   4. A creator; a maker; an author; an originator.
      [1913 Webster]

            [He] was the sire of an immortal strain. --Shelley.
      [1913 Webster]

   5. The male parent of a beast; -- applied especially to
      horses; as, the horse had a good sire.
      [1913 Webster]

   Note: Sire is often used in composition; as in grandsire,
         grandfather; great-grandsire, great-grandfather.
         [1913 Webster]

WordNet (r) 3.0 (2006):

sire
    n 1: a title of address formerly used for a man of rank and
         authority
    2: the founder of a family; "keep the faith of our forefathers"
       [syn: forefather, father, sire]
    3: male parent of an animal especially a domestic animal such as
       a horse
    v 1: make children; "Abraham begot Isaac"; "Men often father
         children but don't recognize them" [syn: beget, get,
         engender, father, mother, sire, generate, bring
         forth]