Origin: 1860–65; < Gk
sýnoikos dwelling in the same house, equiv. to
syn- syn- +
oik- (base of
oîkos, oikía house,
oikeîn to dwell) +
-os adj. suffix;
see -ous 
Related forms: syn⋅oi⋅cous⋅ly, syn⋅oe⋅cious⋅ly, adverb
syn⋅oi⋅cous⋅ness, syn⋅oe⋅cious⋅ness, noun
[si-noi-kuh