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[ih-fem-er-id] /ɪˈfɛm ər ɪd/

an insect of the order Ephemeroptera, comprising the mayflies.
any insect of the order Ephemeroptera (or Ephemerida), which comprises the mayflies Also called ephemeropteran


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  • Ephemeris

    [ih-fem-er-is] /ɪˈfɛm ər ɪs/ noun, plural ephemerides [ef-uh-mer-i-deez] /ˌɛf əˈmɛr ɪˌdiz/ (Show IPA) 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. /ɪˈfɛmərɪs/ noun (pl) ephemerides (ˌɛfɪˈmɛrɪˌdiːz) 1. a table giving the […]

  • Ephemeris-second

    noun, Astronomy. 1. the unit of ephemeris time, defined as a precise fraction of the length of the tropical year 1900.

  • Ephemeris-time

    noun, Astronomy. 1. time measured by the orbital movements of the earth, the moon, and the planets. noun 1. time that is based on the orbit of the earth around the sun rather than the axial rotation of the earth, one ephemeris second being 1/31 556 925.9747 of the tropical year 1900. It was used […]

  • Ephemeron

    [ih-fem-uh-ron, -er-uh n] /ɪˈfɛm əˌrɒn, -ər ən/ noun, plural ephemera [ih-fem-er-uh] /ɪˈfɛm ər ə/ (Show IPA), ephemerons. 1. anything short-lived or ephemeral. 2. ephemera, items designed to be useful or important for only a short time, especially pamphlets, notices, tickets, etc. /ɪˈfɛməˌrɒn/ noun (pl) -era (-ərə), -erons 1. (usually pl) something transitory or short-lived n. […]

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