PIE*nobh「へそ」が語源で、語源的にはumbilicus「へその緒」と同じ。
The cords of all link back, strandentwining cable of all flesh. [Joyce, "Ulysses"]"Navel" words from other roots include Lithuanian bamba, Sanskrit bimba- (also "disk, sphere"), Greek bembix, literally "whirlpool." Old Church Slavonic papuku, Lithuanian pumpuras are originally "bud." Considered a feminine sexual center since ancient times, and still in parts of the Middle East, India, and Japan. In medieval Europe, it was averred that "[t]he seat of wantonness in women is the navel." [Cambridge bestiary, C.U.L. ii.4.26] Words for it in most languages have a secondary sense of "center." Meaning "center or hub of a country" is attested in English from late 14c. To contemplate (one's) navel "meditate" is from 1933; hence navel-gazer (1952); see also omphaloskepsis. Navel orange attested from 1888.