from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An asteroid that orbits the sun in just over 365 days in a highly eccentric and inclined elliptical orbit that periodically brings it close to Earth. Earth has a strong gravitational influence on Cruithne, but the inclined orbit of the asteroid precludes a collision between the two bodies and also the possibility of Cruithne ever orbiting Earth as a second moon.
  • noun The Picts.


from The American Heritage® Dictionary of the English Language, 4th Edition

[Old Irish Cruithne, the Picts (the asteroid being named by Duncan Waldron, the Scottish amateur astronomer who discovered it in 1986), from Cruithen, a Pict; see kwer- in Indo-European roots.]


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  • The name of the second moon of our planet. I would like to hear a pronunciation...


    February 7, 2012

  • Cruithne is in fact not really 'Earth's second moon' but more of a quasi-satellite, because it doesn't actually orbit the Earth.

    February 7, 2012

  • The word is pronounced "krooy-nyuh" which can also be written as "KROOee-nyuh" and in many other ways. My point is that the stress is on the first syllable, which contains both the OO and the ee sounds. The word has only two syllables, "cruith" and "ne". The stress is not on the "ee" sound. The OOee or ooy (ui) diphthong is very common in the Celtic languages.

    February 7, 2012