Slime pit

from 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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