兩性異形

两性异形
liǎngxìngyìxíng
sexual dimorphism

CEDICT

Entry Composition

1 兩性 liǎngxìng
  1. male and female
  2. both types (acid and alkaline, positive and negative etc)
  3. (chemistry) amphoteric
2 異形 yìxíng
  1. not the usual type
  2. atypical
  3. heterotype