Many languages have separate words for "day" and "24-hour-cycle" ("den'" and "sutki" in Russian, "yom" and "yamima" in Hebrew). In English the word "day" may re

Many languages have separate words for "day" and "24-hour-cycle" ("den'" and "sutki" in Russian, "yom" and "yamima" in Hebrew). In English the word "day" may refer to both, depending on context. There is a word “nychthemeron”, but it's not used in day-to-day speech.