成虫

成蟲
chéngchóng
imago (adult, sexually mature insect, the final stage of its development)

CEDICT

imago (final stage in an insect's development)

Wiktionary

昆虫类的幼虫，经过蛹的时期，蜕变成与母虫同一形态，而能繁殖后代的成熟昆虫。如蚕的成虫是蛾，毛毛虫的成虫是蝴蝶，孑孓的成虫是蚊子等。

重編國語辭典

Entry Composition

1 成 chéng
  1. to succeed
  2. to finish
  3. to complete
  4. to accomplish
  5. to become
  6. to turn into
  7. to be all right
  8. OK!
  9. one tenth
=2 虫 chóng variant of 虫 chóng
=2 虫 chóng
  1. lower form of animal life, including insects, insect larvae, worms and similar creatures
  2. (fig.) person with a particular undesirable characteristic

classifiers: 條, 隻