Commonly used abbreviation for respiration(s). For example, in a medical chart, you might see scrawled bp90/60 t98.6 hr 60/reg r15 , which is short hand signifying that the blood pressure is 90/60 mm hg, the temperature (t) is 98.6 degrees fahrenheit, the heart rate (hr) is 60/min and regular, and the respirations (r) 15/min. (this example would be entirely normal for an adult or older child).
Symbol for a ring chromosome, a structurally abnormal chromosome in which the end of each chromosome arm has been lost and the broken arms have been reunited in ring formation.
