cardi: This root refers to the heart. For example, “cardiology” is the study of the heart and its functions.
chron: This root refers to time. For example, “chronology” is the study of time and its sequence of events.
gress: This root refers to movement or progress. For example, “progress” means forward movement or advancement 1.
juxta: This root means near or beside. For example, “juxtaposition” is the act of placing two things side by side for comparison.
therm: This root refers to heat. For example, “thermometer” is a device used to measure temperature.