The Collaborative International Dictionary of English v.0.48:

Spade \Spade\, n. [AS. spaed; spada; akin to D. spade, G.
   spaten, Icel. spa[eth]i, Dan. & Sw. spade, L. spatha a
   spatula, a broad two-edged sword, a spathe, Gr. spa`qh. Cf.
   Epaulet, Spade at cards, Spathe, Spatula.]
   1. An implement for digging or cutting the ground, consisting
      usually of an oblong and nearly rectangular blade of iron,
      with a handle like that of a shovel. "With spade and
      pickax armed." --Milton.
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   2. [Sp. espada, literally, a sword; -- so caused because
      these cards among the Spanish bear the figure of a sword.
      Sp. espada is fr. L. spatha, Gr. spa`qh. See the Etymology
      above.] One of that suit of cards each of which bears one
      or more figures resembling a spade.
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            "Let spades be trumps!" she said.     --Pope.
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   3. A cutting instrument used in flensing a whale.
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   Spade bayonet, a bayonet with a broad blade which may be
      used digging; -- called also trowel bayonet.

   Spade handle (Mach.), the forked end of a connecting rod in
      which a pin is held at both ends. See Illust. of Knuckle
      joint, under Knuckle.
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The Collaborative International Dictionary of English v.0.48:

Trowel \Trow"el\, n. [OE. truel, OF. truele, F. truelle, LL.
   truella, L. trulla, dim. of trua a ladle; probably akin to
   Gr. ? a stirrer, ladle, G. quirl a stirrer, MHG. twirel, OHG.
   dwiril, Icel. [thorn]vara, AS. [thorn]wiril. Cf. Twirl.]
   1. A mason's tool, used in spreading and dressing mortar, and
      breaking bricks to shape them.
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   2. A gardener's tool, somewhat like a scoop, used in taking
      up plants, stirring the earth, etc.
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   3. (Founding) A tool used for smoothing a mold.
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   Trowel bayonet. See Spade bayonet, under Spade.

   Fish trowel. See Fish slice, under Fish.
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