Definition of 'mental defective'. Word Frequency. mental defective (ËmÉntÉl dÉªËfÉktÉªv) noun. old-fashioned. a person who suffers from a learning disability or from some form of mental illness. 'You must not say anything,' I enunciated slowly, as if speaking to a mental defective.
How to Measure. To measure your horse, have him stand square on a level surface. Hold the tape or stick so it is perpendicular to the ground and beside the horse so it is even with the top point of the horseâs withers. If you are using a proper measuring stick, lower the bar so it meets the top of the horseâs withers.
(This will not work for ponies or pony size horses.) Here is a formula with example: 1  Add up the total weight of the horse, rider, and tack. 2  Measure the circumference of the cannon bone midway between the knee and fetlock. 3  Divide the total weight by the circumference.  Divide the result by two.