centromere

from WordNet (r) 3.0 (2006)

centromere
    n 1: a specialized condensed region of each chromosome that
         appears during mitosis where the chromatids are held
         together to form an X shape; "the centromere is difficult
         to sequence" [syn: {centromere}, {kinetochore}]

from The Collaborative International Dictionary of English v.0.48

centromere \centromere\ n. (Biol.)
   a specialized condensed region of a chromosomes that appears
   during mitosis where the chromatids are held together to form
   an X shape.
   [WordNet 1.5]

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