Attention deficit hyperactivity disorder (ADHD) should be diagnosed and treated in children as young as age 4, according to new guidelines from the American Academy of Pediatrics. Skip to main content
ephemeris. 1  a table showing the positions of a heavenly body on a number of dates in a regular sequence. 2  an astronomical almanac containing such tables. 3  Archaic. an almanac or calendar.
ephemeral (plural ephemerals) Something which lasts for a short period of time. Synonyms (short-lived): ephemeron; Derived terms . spring ephemeral; Adjective . ephemeral (comparative more ephemeral, superlative most ephemeral) Lasting for a short period of time. Vicesimus Knox Esteem, lasting esteem, the esteem of good men, like himself, will be his reward, when the gale of ephemeral popularity shall have gradually subsided.