Prefix from the Greek "oikos," meaning "house" (3)

I believe the answer is:

eco

(Other definitions for eco that I've seen before include "Umberto - - , novelist" , "Environmental group" , "Green prefix" , "Umberto -, Italian author (The Name of the Rose)" , "Umberto --, Italian writer" .)

I've seen this clue in The Wall Street Journal.

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