From The Collaborative International Dictionary of English v.0.48 :
Miliaria \Mil`i*a"ri*a\, n. [NL. See Miliary.] (Med.) A fever accompanied by an eruption of small, isolated, red pimples, resembling a millet seed in form or size; miliary fever. [1913 Webster]From WordNet (r) 3.0 (2006) :
miliaria n 1: obstruction of the sweat ducts during high heat and humidity [syn: prickly heat, heat rash, miliaria]