aceph·a·lous /(ˌ)eˈsɛfələs, əˈsɛ-/
  (a.)無頭的,群龍無首的
  aceph·a·lous /(ˈ)eˈsɛfələs, əˈsɛf-/ 形容詞
  無頭的
  A·ceph·a·lous a.
  1. Headless.
  2. Zool. Without a distinct head; -- a term applied to bivalve mollusks.
  3. Bot. Having the style spring from the base, instead of from the apex, as is the case in certain ovaries.
  4. Without a leader or chief.
  5. Wanting the beginning.
     A false or acephalous structure of sentence.   --De Quincey.
  6. Pros. Deficient at the beginning, as a line of poetry.
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  acephalous
       adj : lacking a head or a clearly defined head; "acephalous worms"