When is a spade supposed to be called a shovel?

Amongst my work colleagues, I work with a girl who is quite short. She just breaks 5 foot in the old scale. Which begged the question (of course): what is the difference between a midget and a dwarf? And what height must you be to qualify as a midget? Or for that matter, a dwarf?

Dictionary.com defines a midget as 'an extremely small person who is otherwise normally proportioned'. It also says that this term is now deemed offensive, so I promise not to use it in regular conversation again.

Dictionary.com defines a dwarf as 'an abnormally small person, often having limbs and features atypically proportioned or formed'. It does not say that the word dwarf is offensive, so I will use it until I am told, as I invariably will, that it is not PC.

So, as I read it, a dwarf is an out of proportion little person while a midg ... little person is a little person who is in proportion.

That leaves the second question. Alas, after much scouring of the web I cannot find a definitive answer as to what height qualifies one as a little person of either the M or D type. Drop me a line if you can shed any light on this issue.
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