Preterm Labor

Labor that begins before the 37th week of pregnancy. If a woman's labor cannot be stopped, a preterm birth is likely. Preterm birth is a common cause of birth defects and infant death.
Found on http://www.pregnology.com/AZ/P/9

Preterm labor

Labor
Found on http://www.encyclo.co.uk/local/22139

preterm labor

Labor that starts after 20 weeks but before the end of the 37th week
Found on https://www.fitpregnancy.com/pregnancy/pregnancy-health/pregnancy-glossary
No exact match found