同源异形
tóng​yuán​yì​xíng

doublet

tóng​yuán​yì​xíng doublet
  1. 同源 tóng​yuán
    cognate
    (linguistics) descending from the same language or root; sharing an affinity
  2. 异形 異形 yì​xíng
    strange shape
    a strange or unusual form; an atypical shape; heterotype

tóng​yuán​yì​xíng homeosis
  1. 同源 tóng​yuán
    homologous
    (biology) having the same relation, relative position, or structure
  2. 异形 異形 yì​xíng
    heteromorphism
    (bound form) having different forms at different stages of a life cycle or in different parts of an organism