Общая лексика: каждый (лат.) (If a medicine is to be taken every so- many hours, it is written "q_h"; the "q" standing for the Latin word for once "quaque" and the "h" indicating the number of hours. So, for example, "2 caps q4h" means "Take 2 capsules every)
Универсальный англо-русский словарь. Академик.ру. 2011.