The Collaborative International Dictionary of English v.0.48:

Slime \Slime\ (sl[imac]m), n. [OE. slim, AS. sl[imac]m; akin to
   D. slijm, G. schleim, MHG. sl[imac]men to make smooth, Icel.
   sl[imac]m slime, Dan. sliim; cf. L. limare to file, polish,
   levis smooth, Gr. ???; or cf. L. limus mud.]
   1. Soft, moist earth or clay, having an adhesive quality;
      viscous mud.
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            As it [Nilus] ebbs, the seedsman
            Upon the slime and ooze scatters his grain. --Shak.
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   2. Any mucilaginous substance; any substance of a dirty
      nature, that is moist, soft, and adhesive.
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   3. (Script.) Bitumen. [Archaic]
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            Slime had they for mortar.            --Gen. xi. 3.
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   4. pl. (Mining) Mud containing metallic ore, obtained in the
      preparatory dressing. --Pryce.
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   5. (Physiol.) A mucuslike substance which exudes from the
      bodies of certain animals. --Goldsmith.
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   Slime eel. (Zool.) See 1st Hag, 4.

   Slime pit, a pit for the collection of slime or bitumen.
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The Collaborative International Dictionary of English v.0.48:

Slime \Slime\ (sl[imac]m), v. t. [imp. & p. p. Slimed
   (sl[imac]md); p. pr. & vb. n. Sliming.]
   To smear with slime. --Tennyson.
   [1913 Webster] slime mold

WordNet (r) 3.0 (2006):

slime
    n 1: any thick, viscous matter [syn: sludge, slime, goo,
         goop, gook, guck, gunk, muck, ooze]
    v 1: cover or stain with slime; "The snake slimed his victim"