Definition of preterm adjective from the Oxford Advanced American Dictionary

 

preterm

 adjective
adjective
NAmE//ˌpriˈtərm//
 
 
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born or happening after a short pregnancy, especially one that is less than 37 weeks caring for low birthweight and preterm babies a preterm birth/delivery
pretermadverb
 
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Babies born preterm are at greater risk of needing hospitalization.