There are multiple definitions:

1. progressive three layered(English)

   • LPG

2. preterm labor(English)

   • defined as regular uterine contractions occurring at least once every 10 minutes and resulting in cervical dilatation or effacement before 37 weeks' gestation. A preterm infant is any infant delivered before 37 weeks' gestation. Any infant weighing less than 2.5 kg or 1.5 kg at birth is a low-birth-weight or very-low-birth-weight infant, respectively, regardless of gestational age. At 29 weeks' gestation, more than 90% of fetuses weigh less than 1.5 kg. Prematurity is the leading cause of perinatal morbidity and mortality in the US, accounting for 60% to 80% of infant deaths in those without congenital anomalies. Advances in neonatology have decreased mortality for very-low-birth-weight infants
   • CL, VLBW
   • Pregnancy, Obstetrics, Neonatal situation, Ultrasound, Screening
   • https://doi.org…-2215-2.50195-2

3. phase-transited lysozyme(English)

   • priming method provides a promising strategy for fabricating long-term antibacterial multilayer coatings on titanium surfaces
   • AgNP, HA, TCEP, Ti
   • Bacteriology
   • https://doi.org…al.pone.0146957

4. pharyngeal tracheal lumen(English)

   • a new airway control device for emergency medical technicians and paramedics and functions as either an esophageal obturator or an endotracheal tube
   • LwPTL, OSA, EMT
   • Respiratory system, Emergency medicine
   • https://doi.org…0644(89)80459-7