homologous
/hɒˈmɒləgəs/adjective
1- having the same relation, relative position, or structure, in particular（关系, 位置, 结构）相应的, 类似的, 尤指：
1.1
- Biology (of organs) similar in position, structure, and evolutionary origin but not necessarily in function【生】（器官）同源的（位置、结构或生物起源相似, 但功能不一定相似）：
a seal's flipper is homologous with the human arm.
海豹的鳍状肢与人的胳膊是同源的。常与ANALOGOUS 相对。
1.2
- Biology (of chromosomes) pairing at meiosis and having the same structural features and pattern of genes【生】（染色体）同源的。
1.3
- Chemistry (of a series of chemical compounds)having the same functional group but differing in composition by a fixed group of atoms【化】（一系列化合物）同系的。
词源
mid 17th cent.: via medieval Latin from Greek homologos 'agreeing, consistent', from homos 'same'+logos 'ratio, proportion'.