Ephemera

ef-em′er-a, n. the Mayfly, a genus of short-lived insects: that which lasts a short time.— adj. Ephem′eral , existing only for a day: daily: short-lived.— n. anything lasting a short time.— ns. Ephemeral′ity ; Ephem′erid , an insect belonging to the group Ephemeridæ .— adj. Ephemerid′ian .— ns. Ephem′eris , an account of daily transactions: a journal: an astronomical almanac:— pl. Ephemerides (ef-e-mer′i-dēz); Ephem′erist , one who studies the daily motions of the planets; Ephem′eron , an insect that lives but a day.— adj. Ephem′erous . [Through L.,—Gr. ephēmeros , living a day— epi , for, hēmera , a day.]