(Britain, historical) December 21st, St. Thomas's Day, a day for begging before Christmas.

(medicine) Unable to see clearly in bright light; hemeralopic

Alternative spelling of day-blind

The day of the week/month etc. when wages are issued.

plural of banyan day

(medicine) The inability to see clearly in bright light; hemeralopia

A time too soon to make a decision or come to a conclusion. / The initial period of an innovation / Initial stages of a project.

(US) A day when one is permitted to not attend work in order to go on a vacation or attend to other matters.

plural of name day

One of the dog days of summer: a late-summer day.