preterm

[pree-turm]
noun
  1. a baby born prematurely, especially one born before the 37th week of pregnancy and weighing less than 5½ pounds (2.5 kg).

Origin of preterm

First recorded in 1925–30; pre- + term
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for preterm

preterm

adjective
  1. (of a baby) born prematurely
adverb
  1. prematurely
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for preterm
adj.

also pre-term, 1928, from pre- + term (n.).

Online Etymology Dictionary, © 2010 Douglas Harper

preterm in Medicine

preterm

[prētûrm′, prē-tûrm]
adj.
  1. Occurring or appearing before the expected time at the end of a full-term pregnancy.
n.
  1. An infant born prematurely.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.