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 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"