commorientes
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commorientes
(ˌkɒmɒrɪˈɛntiːz)pl n
people whose deaths are so close to each other (being caused by the same calamity) that it is not possible to determine who died first. It is assumed that the elder person died first
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014