Source : Webster's Revised Unabridged Dictionary (1913)

Pectoral \Pec"to*ral\, a. [L. pectoralis, fr. pectus, -oris the
   breast; cf. F. pectoral.]
   1. Of or pertaining to the breast, or chest; as, the pectoral
      muscles.

   2. Relating to, or good for, diseases of the chest or lungs;
      as, a pectoral remedy.

   3. (Zo["o]l.) Having the breast conspicuously colored; as,
      the pectoral sandpiper.

   {Pectoral arch}, or {Pectoral girdle} (Anat.), the two or
      more bony or cartilaginous pieces of the vertebrate
      skeleton to which the fore limbs are articulated; the
      shoulder girdle. In man it consists of two bones, the
      scapula and clavicle, on each side.

   {Pectorial cross} (Eccl.), a cross worn on the breast by
      bishops and abbots, and sometimes also by canons.

   {Pectorial} fins, or {Pectorials} (Zo["o]l.), fins situated
      on the sides, behind the gills. See Illust. under {Fin}.
      

   {Pectorial rail}. (Zo["o]l.) See {Land rail}
      (b) under {Land}.

   {Pectorial sandpiper} (Zo["o]l.), the jacksnipe
      (b) .

Pectoral \Pec"to*ral\, n. [L. pectorale a breastplate, neut. of
   pectorials.]
   1. A covering or protecting for the breast.

   2. (Eccl.)
      (a) A breastplate, esp. that worn by the Jewish high
          person.
      (b) A clasp or a cross worn on the breast.

   3. A medicine for diseases of the chest organs, especially
      the lungs.

Girdle \Gir"dle\, n. [OE. gurdel, girdel, AS. gyrdel, fr.
   gyrdan; akin to D. gordel, G. g["u]rtel, Icel. gyr?ill. See
   {Gird}, v. t., to encircle, and cf. {Girth}, n.]
   1. That which girds, encircles, or incloses; a circumference;
      a belt; esp., a belt, sash, or article of dress encircling
      the body usually at the waist; a cestus.

            Within the girdle of these walls.     --Shak.

            Their breasts girded with golden girdles. --Rev. xv.
                                                  6.

   2. The zodiac; also, the equator. [Poetic] --Bacon.

            From the world's girdle to the frozen pole.
                                                  --Cowper.

            That gems the starry girdle of the year. --Campbell.

   3. (Jewelry) The line ofgreatest circumference of a
      brilliant-cut diamond, at which it is grasped by the
      setting. See Illust. of {Brilliant}. --Knight.

   4. (Mining) A thin bed or stratum of stone. --Raymond.

   5. (Zo["o]l.) The clitellus of an earthworm.

   {Girdle bone} (Anat.), the sphenethmoid. See under
      {Sphenethmoid}.

   {Girdle wheel}, a spinning wheel.

   {Sea girdle} (Zo["o]l.), a ctenophore. See {Venus's girdle},
      under {Venus}.

   {Shoulder}, {Pectoral}, & {Pelvic}, {girdle}. (Anat.) See
      under {Pectoral}, and {Pelvic}.

   {To have under the girdle}, to have bound to one, that is, in
      subjection.

Source : WordNet®

pectoral
     n 1: either of two large muscles of the chest [syn: {pectoral
          muscle}, {pectoralis}, {musculus pectoralis}, {pecs}]
     2: an adornment worn on the chest or breast [syn: {pectoral
        medallion}]

pectoral
     adj : of or relating to the chest or thorax; "pectoral organ"
           [syn: {thoracic}]