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Ap star

[ey-pee]
noun Astronomy.
  1. a peculiar A star whose emission spectrum is characterized by abnormally strong lines of certain ionized metals.
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Origin of Ap star

1970–75; A (star) + p (abbreviation for peculiar star; see peculiar,def 6)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018