Source : Webster's Revised Unabridged Dictionary (1913)

Pug \Pug\, n. [Hind. pag foot.]
   A footprint; a track; as of a boar. [India]

Puck \Puck\, n. [OE. pouke; cf. OSw. puke, Icel. p[=u]ki an evil
   demon, W. pwca a hobgoblin. Cf. {Poker} a bugbear, {Pug}.]
   1. (Medi[ae]val Myth.) A celebrated fairy, ``the merry
      wanderer of the night;'' -- called also {Robin
      Goodfellow}, {Friar Rush}, {Pug}, etc. --Shak.

            He meeteth Puck, whom most men call Hobgoblin, and
            on him doth fall.                     --Drayton.

   2. (Zo["o]l.) The goatsucker. [Prov. Eng.]

Pug \Pug\, v. t. [imp. & p. p. {Pugged}; p. pr. & vb. n.
   {Pugging}.] [Cf. G. pucken to thump. beat.]
   1. To mix and stir when wet, as clay for bricks, pottery,
      etc.

   2. To fill or stop with clay by tamping; to fill in or spread
      with mortar, as a floor or partition, for the purpose of
      deadening sound. See {Pugging}, 2.

Pug \Pug\, n.
   1. Tempered clay; clay moistened and worked so as to be
      plastic.

   2. A pug mill.

   {Pug mill}, a kind of mill for grinding and mixing clay,
      either for brickmaking or the fine arts; a clay mill. It
      consists essentially of an upright shaft armed with
      projecting knives, which is caused to revolve in a hollow
      cylinder, tub, or vat, in which the clay is placed.

Pug \Pug\, n. [Corrupted fr. puck. See {Puck}.]
   1. An elf, or a hobgoblin; also same as {Puck}. [Obs.] --B.
      Jonson.

   2. A name for a monkey. [Colloq.] --Addison.

   3. A name for a fox. [Prov. Eng.] --C. Kingsley.

   4. An intimate; a crony; a dear one. [Obs.] --Lyly.

   5. pl. Chaff; the refuse of grain. [Obs.] --Holland.

   6. A prostitute. [Obs.] --Cotgrave.

   7. (Zo["o]l.) One of a small breed of pet dogs having a short
      nose and head; a pug dog.

   8. (Zo["o]l.) Any geometrid moth of the genus {Eupithecia}.

Source : WordNet®

pug
     n : small compact smooth-coated breed of Asiatic origin having a
         tightly curled tail and broad flat wrinkled muzzle [syn:
         {pug-dog}]
     [also: {pugging}, {pugged}]