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1. Oxford American Dictionary

   boss

   • IPA[bôs]

   美式

   • n.
     a stud on the center of a shield；a piece of ornamental carving covering the point where the ribs in a vault or ceiling cross.

   • noun: boss, plural noun: bosses

2. • 釋義

   n.

   名詞

   • 1. a stud on the center of a shield a heavy wooden shield with a metal boss
   • ▪ a piece of ornamental carving covering the point where the ribs in a vault or ceiling cross.
   • ▪ the central part of a propeller, wheel, or circular object the impact-absorbing boss of a steering wheel a climber with clusters of single white blooms around a pink central boss of stamens
   • 2. a large mass of igneous rock protruding through other strata.
   • 3. an enlarged part of a shaft.