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castor

noun

  1. Rare a beaver
  2. a sexual gland of the beaver containing a strong-smelling, oily substance used as a scent in trapping and in making perfumes
    also castoreum
  3. a hat of beaver or rabbit fur

noun

caster (senses & )

noun

  1. Gr. & Rom. Myth. the mortal twin of Pollux
  2. a multiple star, actually the second brightest star in the constellation Gemini although it is considered the twin of Pollux: magnitude, 1.6

See castor in American Heritage Dictionary 4

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