- ecologyThe branch of biology dealing with the relationships of organisms with their environment and with each other.
- oikosA basic societal unit in Ancient Greece; a household or family line.
- eco-ecology or the environment (in the ecological sense)
- ecolectA language variety unique to a household.
- oeciumThe household common to the individuals of a compound organism.
- oecusAn apartment, room, or hall in an ancient Roman dwelling house.
- oikocrystAn enclosing crystal in a poikilitic fabric.
- oikologyThe science of houses and homes, considered especially in respect of their sanitary conditions.
- oikonymA type of toponym denoting a settlement or its part.
- oikophobeOne who suffers from oikophobia, especially one who identifies with a global group rather than feelings of patriotism or chauvinism.
- oikophobiaEcophobia; fear of a home environment.
- oikophobicExhibiting or characterized by oikophobia, a dislike of one's own culture or compatriots.