The word people use to mean opposite of nocturnal, or creatures that are active during daylight. The actual word for this is diurnal, but they don't seem to teach this word in school much, so people for some reason invented a new name.
PreppyChick: I'm so glad people are dayturnal. I don't think I could see at night too well.
Me: The term is diurnal, there's no such thing as "dayturnal".