n.[C][U]

1. 变形；质变；（外形等的）完全变化[（+into）]
   She's undergone quite a metamorphosis since you last saw her.

   自你上次见到她以来，她已完全变了一个样子。

2. 变成的形态
3. 【生】变态
   the metamorphosis from a tadpole to a frog

   由蝌蚪演变为青蛙

4. 【医】（某些组织的）变态

n.

1. Zoology  (in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages.
2. a complete change in form or nature.