What is the Fish and Game's legal definition of a compound bow?

Answer: 

Idaho Fish and Game does not have a specific definition of a compound bow.  However, on page 76 of the Idaho Big Game Seasons & Rules brochure for 2012 explains what archery equipment would be unlawful to pursue or kill big game with.  I have copied and pasted this section below.
 
Archery Equipment
In any hunt, including general any-weapon seasons and shortrange
hunts, it is unlawful to pursue or kill big game animals:
• With arrows or bolts having broadheads measuring less
than 7/8 inch in width and having a primary cutting edge
less than 0.015 inch thick.
• With any bow having a peak draw weight of less than 40
pounds up to or at a draw of 28 inches.
• With an arrow or bolt wherein the broadhead does not
precede shaft and nock.
• With any chemicals or explosives attached to the arrow or
bolt.
• With arrows or bolts having expanding broadheads.
• With arrows or bolts having barbed broadheads, which is
a broadhead with any portion of which forms an angle less
than 90 degrees with the shaft or ferrule.
• With any electronic or tritium-powered device attached
to an arrow, bolt or bow. Except disabled archery permit
holders may use a nonmagnifying sight with battery
powered or tritium lighted reticles.
• With any bow capable of shooting more than one arrow at
a time.
• With any compound bow set at more than 85 percent letoff.
• With an arrow or bolt, and broadhead with a combined
total weight of less than 300 grains.
• With an arrow less than 24 inches from broadhead to nock
inclusive.
• With a bolt (crossbow) less than 12 inches from broadhead
to nock inclusive.

Answered on: 
Friday, September 21, 2012 - 2:17 PM MDT