acentric

adj. lacking a center

Adjective
1. lacking a centromere; "an acentric chromosome fragment"
(pertainym) centromere, kinetochore
2. not centered or having no center
(similar) eccentric, nonconcentric

(a.)
Not centered; without a center.
  

A chromosome fragment lacking a centromere (the "waist" of the chromosome essential for the division and the retention of the chromosome in the cell).

adj.
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