The Collaborative International Dictionary of English v.0.48:

Homology \Ho*mol"o*gy\, n. [Gr. ? agreement. See Homologous.]
   1. The quality of being homologous; correspondence; relation;
      as, the homologyof similar polygons.
      [1913 Webster]

   2. (Biol.) Correspondence or relation in type of structure in
      contradistinction to similarity of function; as, the
      relation in structure between the leg and arm of a man; or
      that between the arm of a man, the fore leg of a horse,
      the wing of a bird, and the fin of a fish, all these
      organs being modifications of one type of structure.
      [1913 Webster]

   Note: Homology indicates genetic relationship, and according
         to Haeckel special homology should be defined in terms
         of identity of embryonic origin. See Homotypy, and
         Homogeny.
         [1913 Webster]

   3. (Chem.) The correspondence or resemblance of substances
      belonging to the same type or series; a similarity of
      composition varying by a small, regular difference, and
      usually attended by a regular variation in physical
      properties; as, there is an homology between methane,
      CH4, ethane, C2H6, propane, C3H8, etc., all members
      of the paraffin series. In an extended sense, the term is
      applied to the relation between chemical elements of the
      same group; as, chlorine, bromine, and iodine are said to
      be in homology with each other. Cf. Heterology.
      [1913 Webster]

   General homology (Biol.), the higher relation which a
      series of parts, or a single part, bears to the
      fundamental or general type on which the group is
      constituted. --Owen.

   Serial homology (Biol.), representative or repetitive
      relation in the segments of the same organism, -- as in
      the lobster, where the parts follow each other in a
      straight line or series. --Owen. See Homotypy.

   Special homology (Biol.), the correspondence of a part or
      organ with those of a different animal, as determined by
      relative position and connection. --Owen.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Special \Spe"cial\, a. [L. specialis, fr. species a particular
   sort, kind, or quality: cf. F. sp['e]cial. See Species, and
   cf. Especial.]
   1. Of or pertaining to a species; constituting a species or
      sort.
      [1913 Webster]

            A special is called by the schools a "species". --I.
                                                  Watts.
      [1913 Webster]

   2. Particular; peculiar; different from others;
      extraordinary; uncommon.
      [1913 Webster]

            Our Savior is represented everywhere in Scripture as
            the special patron of the poor and the afficted.
                                                  --Atterbury.
      [1913 Webster]

            To this special evil an improvement of style would
            apply a special redress.              --De Quincey.
      [1913 Webster]

   3. Appropriate; designed for a particular purpose, occasion,
      or person; as, a special act of Parliament or of Congress;
      a special sermon.
      [1913 Webster]

   4. Limited in range; confined to a definite field of action,
      investigation, or discussion; as, a special dictionary of
      commercial terms; a special branch of study.
      [1913 Webster]

   5. Chief in excellence. [Obs.]
      [1913 Webster]

            The king hath drawn
            The special head of all the land together. --Shak.
      [1913 Webster]

   Special administration (Law), an administration limited to
      certain specified effects or acts, or one granted during a
      particular time or the existence of a special cause, as
      during a controversy respecting the probate of a will, or
      the right of administration, etc.

   Special agency, an agency confined to some particular
      matter.

   Special bail, Bail above, or Bail to the action (Law),
      sureties who undertake that, if the defendant is
      convicted, he shall satisfy the plaintiff, or surrender
      himself into custody. --Tomlins. --Wharton (Law Dict.).

   Special constable. See under Constable. --Bouvier.

   Special damage (Law), a damage resulting from the act
      complained of, as a natural, but not the necessary,
      consequence of it.

   Special demurrer (Law), a demurrer for some defect of form
      in the opposite party pleading, in which the cause of
      demurrer is particularly stated.

   Special deposit, a deposit made of a specific thing to be
      kept distinct from others.

   Special homology. (Biol.) See under Homology.

   Special injuction (Law), an injuction granted on special
      grounds, arising of the circumstances of the case.
      --Daniell.

   Special issue (Law), an issue produced upon a special plea.
      --Stephen.

   Special jury (Law), a jury consisting of persons of some
      particular calling, station, or qualification, which is
      called upon motion of either party when the cause is
      supposed to require it; a struck jury.

   Special orders (Mil.), orders which do not concern, and are
      not published to, the whole command, such as those
      relating to the movement of a particular corps, a detail,
      a temporary camp, etc.

   Special partner, a limited partner; a partner with a
      limited or restricted responsibility; -- unknown at common
      law.

   Special partnership, a limited or particular partnership;
      -- a term sometimes applied to a partnership in a
      particular business, operation, or adventure.

   Special plea in bar (Law), a plea setting forth particular
      and new matter, distinguished from the general issue.
      --Bouvier.

   Special pleader (Law), originally, a counsel who devoted
      himself to drawing special counts and pleas; in a wider
      sense, a lawyer who draws pleadings.

   Special pleading (Law), the allegation of special or new
      matter, as distingiushed from a direct denial of matter
      previously alleged on the side. --Bouvier. The popular
      denomination of the whole science of pleading. --Stephen.
      The phrase is sometimes popularly applied to the specious,
      but unsound, argumentation of one whose aim is victory,
      and not truth. --Burrill.

   Special property (Law), a qualified or limited ownership
      possession, as in wild animals, things found or bailed.

   Special session, an extraordinary session; a session at an
      unusual time or for an unusual purpose; as, a special
      session of Congress or of a legislature.

   Special statute, or Special law, an act of the
      legislature which has reference to a particular person,
      place, or interest; a private law; -- in distinction
      from a general law or public law.

   Special verdict (Law), a special finding of the facts of
      the case, leaving to the court the application of the law
      to them. --Wharton (Law Dict.).
      [1913 Webster]

   Syn: Peculiar; appropriate; specific; dictinctive;
        particular; exceptional; singular. See Peculiar.
        [1913 Webster]