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Born a twin or twins: twinborn sisters.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


born as a twin
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



born at the same birth.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Shown with her twinborn calves at foot, she is by Islavale Sabre, and was breed champion at the Highland Show and interbreed champion at the Black Isle.
Lactation Biology Symposium: maternal nutrition during early and mid-to-late pregnancy: Comparative effects on milk production of twinborn ewe progeny during their first lactation.
[14] prepared Si[O.sub.2] straight nanowires, spring-shaped nanowires, twinborn nanospring, fishbone-shaped nanowires, and braided-like helical nanowires.