n.[C]

1. 部分；部门；切片，断片
   The company dominates this segment of the market.

   该公司控制了这一部分市场。

2. 【数】线段；弓形；球缺
3. 【语】语流中的一个音素（或单个音）
4. 【生】体节，节
   The sacrum has five segments fused together into one large bone.

   荐椎是由五块椎骨融合成一块大骨头。

5. 【电脑】数据段，程序段

vt.

1. 分割，切割

vi.

1. 分割成部分；切成片（或段等）

n.

1. each of the parts into which something is or may be divided.
2. Geometry  a part of a circle cut off by a chord, or a part of a sphere cut off by a plane not passing through the centre.
3. Phonetics  the smallest distinct part of a spoken utterance, especially with regard to vowel and consonant sounds.
4. Zoology  each of a series of similar anatomical units of which the body and appendages of some animals are composed.

v.

1. divide into segments.
2. Embryology  (of a cell) undergo cleavage.