acen·tric /(ˌ)eˈsɛntrɪk/
  (a.)無中心的
  acen·tric /(ˈ)eˈsɛntrɪk/ 形容詞
  無著絲粒的,無著絲點的
  A·cen·tric a.  Not centered; without a center.
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  acentric
       adj 1: lacking a centromere; "an acentric chromosome fragment"
       2: not centered or having no center