What is "renal cast"

Cast \Cast\, n. [Cf. Icel., Dan., & Sw. kast.]

1. The act of casting or throwing; a throw.

2. The thing thrown.

   A cast of dreadful dust.
   --Dryden.

3. The distance to which a thing is or can be thrown. ``About a stone's cast.''
   --Luke xxii. 41.

4. A throw of dice; hence, a chance or venture.

   An even cast whether the army should march this way or that way.
   --Sowth.

   I have set my life upon a cast, And I will stand the hazard of the die.
   --Shak.

5. That which is throw out or off, shed, or ejected; as, the skin of an insect, the refuse from a hawk's stomach, the excrement of a earthworm.

6. The act of casting in a mold.

   And why such daily cast of brazen cannon.
   --Shak.

7. An impression or mold, taken from a thing or person; amold; a pattern.

8. That which is formed in a mild; esp. a reproduction or copy, as of a work of art, in bronze or plaster, etc.; a casting.

9. Form; appearence; mien; air; style; as, a peculiar cast of countenance. ``A neat cast of verse.''
   --Pope.

   An heroic poem, but in another cast and figure.
   --Prior.

   And thus the native hue of resolution Is sicklied o'er with the pale cast of thought.
   --Shak.

10. A tendency to any color; a tinge; a shade.

    Gray with a cast of green.
    --Woodward.

11. A chance, opportunity, privilege, or advantage; specifically, an opportunity of riding; a lift. [Scotch]

    We bargained with the driver to give us a cast to the next stage.
    --Smollett.

    If we had the cast o' a cart to bring it.
    --Sir W. Scott.

12. The assignment of parts in a play to the actors.

13. (Falconary) A flight or a couple or set of hawks let go at one time from the hand.
    --Grabb.

    As when a cast of falcons make their flight.
    --Spenser.

14. A stoke, touch, or trick. [Obs.]

    This was a cast of Wood's politics; for his information was wholly false.
    --Swift.

15. A motion or turn, as of the eye; direction; look; glance; squint.

    The cast of the eye is a gesture of aversion.
    --Bacon.

    And let you see with one cast of an eye.
    --Addison.

    This freakish, elvish cast came into the child's eye.
    --Hawthorne.

16. A tube or funnel for conveying metal into a mold.

17. Four; that is, as many as are thrown into a vessel at once in counting herrings, etc; a warp.

18. Contrivance; plot, design. [Obs.]
    --Chaucer.

    A cast of the eye, a slight squint or strabismus.

    Renal cast (Med.), microscopic bodies found in the urine of persons affected with disease of the kidneys; -- so called because they are formed of matter deposited in, and preserving the outline of, the renal tubes.

    The last cast, the last throw of the dice or last effort, on which every thing is ventured; the last chance.