1925, from omphalo- + Greek -skepsis, from skeptesthai "to reflect, look, view" (from PIE root *spek- "to observe"). Also omphaloscopy (1931). Used earlier in the sense of "navel-gazer" were omphalopsychic (1892) and Omphalopsychite (1882) "one of a body of monks who believed the deep contemplation of the navel induced communion with God," a derisive name given to the Hesychasts.
omo-
omophagous
omphalic
omphalo-
omphalos
omphaloskepsis
on
on-
-on
onager
onanism