Ephemeron
Part of speech: noun
Definition: something short lived or transitory
Ephemeral
Part of speech: adjective
Definition: Lasting for a short period of time.Existing for only one day, as with some flowers, insects, and diseases.
Example sentence: The ostensible subject of my photographs may be motion, but the subtext is time. A dancer's movements illustrate the passage of time, giving it a substance, materiality, and space. In my photographs, time is stopped, a split second becomes an eternity, and an ephemeral moment is solid as sculpture.