nounpl. al·loch·thons or al·loch·tho·nes
- One that originated or was formed in a place other than where it is found, especially a rock formation that has been displaced.
- A member of a human population that relocated or was displaced from a particular area.
- Ecology A plant or animal that is not indigenous.
Origin of allochthonGerman : allo-, allo- (from Greek, from allos, other; see al-1 in Indo-European roots) + Greek khth&omacron;n, earth; see dhghem- in Indo-European roots.