Source : Webster's Revised Unabridged Dictionary (1913)

Heck \Heck\, n. [See {Hatch} a half door.] [Written also
   {hack}.]
   1. The bolt or latch of a door. [Prov. Eng.]

   2. A rack for cattle to feed at. [Prov. Eng.]

   3. A door, especially one partly of latticework; -- called
      also {heck door}. [Prov. Eng.] --Halliwell.

   4. A latticework contrivance for catching fish.

   5. (Weaving) An apparatus for separating the threads of warps
      into sets, as they are wound upon the reel from the
      bobbins, in a warping machine.

   6. A bend or winding of a stream. [Prov. Eng.]

   {Half heck}, the lower half of a door.

   {Heck board}, the loose board at the bottom or back of a
      cart.

   {Heck} {box or frame}, that which carries the heck in
      warping.

Heck \Heck\, n. [See {Hatch} a half door.] [Written also
   {hack}.]
   1. The bolt or latch of a door. [Prov. Eng.]

   2. A rack for cattle to feed at. [Prov. Eng.]

   3. A door, especially one partly of latticework; -- called
      also {heck door}. [Prov. Eng.] --Halliwell.

   4. A latticework contrivance for catching fish.

   5. (Weaving) An apparatus for separating the threads of warps
      into sets, as they are wound upon the reel from the
      bobbins, in a warping machine.

   6. A bend or winding of a stream. [Prov. Eng.]

   {Half heck}, the lower half of a door.

   {Heck board}, the loose board at the bottom or back of a
      cart.

   {Heck} {box or frame}, that which carries the heck in
      warping.

Source : WordNet®

heck
     n : a euphemism for `hell'; "Oh what the heck"