Ephemerid is a term used to describe a short-lived or fleeting object or organism. Some synonyms for this word include ephemeral, fleeting, transitory, short-lived, and temporary. These words are often used to describe things that are brief in duration or exist only for a short period. Examples of things that might be described as ephemerid include dark clouds that pass over the sky, a butterfly that only lives for a few days, or even a fleeting emotion. While ephemerid might seem like an obscure term, there are many words in the English language that mean the same thing, allowing us to communicate our ideas more effectively.