microcurie (?ma?kr???kj??r?) n (Units) a millionth of a curieCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014mi?cro?cu?rie (?ma? kr??ky??r i, ?ma? kro? ky??ri) n. a unit of radioactivity, equal to one millionth of a curie; 3.70 x 104 disintegrations per second. Symbol:?Ci, ?c [1910?15] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.