成蟲

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

CEDICT

imago (final stage in an insect's development)

Wiktionary

昆蟲類的幼蟲，經過蛹的時期，蛻變成與母蟲同一形態，而能繁殖後代的成熟昆蟲。如蠶的成蟲是蛾，毛毛蟲的成蟲是蝴蝶，孑孓的成蟲是蚊子等。

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 蟲 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