The Collaborative International Dictionary of English v.0.48:

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.
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            He meeteth Puck, whom most men call
            Hobgoblin, and on him doth fall.      --Drayton.
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   2. (Zool.) The goatsucker. [Prov. Eng.]
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The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, n. [Hind. pag foot.]
   A footprint; a track; as of a boar. [India]
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, v. t. [imp. & p. p. Pugged; p. pr. & vb. n.
   Pugging.] [Cf. G. pucken to thump. beat.]
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   1. To mix and stir when wet, as clay for bricks, pottery,
      etc.
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   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.
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The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, n.
   1. Tempered clay; clay moistened and worked so as to be
      plastic.
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   2. A pug mill.
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   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.
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The Collaborative International Dictionary of English v.0.48:

Pug \Pug\, n. [Corrupted fr. puck. See Puck.]
   1. An elf, or a hobgoblin; also same as Puck. [Obs.] --B.
      Jonson.
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   2. A name for a monkey. [Colloq.] --Addison.
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   3. A name for a fox. [Prov. Eng.] --C. Kingsley.
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   4. An intimate; a crony; a dear one. [Obs.] --Lyly.
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   5. pl. Chaff; the refuse of grain. [Obs.] --Holland.
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   6. A prostitute. [Obs.] --Cotgrave.
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   7. (Zool.) One of a small breed of pet dogs having a short
      nose and head; a pug dog.
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   8. (Zool.) Any geometrid moth of the genus Eupithecia.
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WordNet (r) 3.0 (2006):

pug
    n 1: small compact smooth-coated breed of Asiatic origin having
         a tightly curled tail and broad flat wrinkled muzzle [syn:
         pug, pug-dog]