Noah Webster's 1828 American Dictionary of the English Language is regarded by many as the finest English
dictionary ever published. The dictionary is available in many forms. I made the content available here for my own purposes,
out of personal admiration for this particular dictionary.
EPHEM'ERA, n. [L. from Gr. daily; a day.] A fever of one day's continuance only. 1. The Day-fly; strictly, a fly that lives one day only; but the word is applied also to insects that are very short-lived, whether they live several days or an hour only. There are several species.