an impetuous or short-tempered person.

1650–60; hot + head Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hothead (ˈhɒtˌhɛd)
an excitable or fiery person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"short-tempered person," 1660, from hot + head; Johnson's dictionary also lists hotmouthed "headstrong, ungovernable."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No hothead nationalist can close borders to a neighbour's goods.
Such plants have two mutant copies of a gene called hothead, which differ from
  the normal gene by a single base pair.
There is no point in preaching non-violent action to a hothead, but a scholarly
  individual might be receptive to certain ideas.
The parent generation had a mutant version of a gene dubbed hothead, which
  causes the plants to have fused flowers.
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