different race; alien race
Refers to a race or ethnic group different from one's own. Can be used in neutral or speculative contexts, but may carry a sense of otherness.
Encounters with alien races are often depicted in science fiction novels.
異人種 emphasizes biological or physical racial difference, while 異民族 focuses on cultural and ethnic identity rather than race.
Compound of 異 (i, 'different') + 人種 (jinshu, 'race'). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese word formation patterns.