omphalic

basic essential fundamental important key paramount pivotal significant

cardinal center chief dominant interior intermediate leading master mean median middle midway primary prime radical ruling salient umbilical

axial centric centroidal equidistant focal foremost inmost inner mid middlemost midmost nuclear outstanding overriding predominant

additional auxiliary extra inessential insignificant minor nonessential secondary trivial unimportant unsubstantial

exterior extreme inferior outer outside subordinate

peripheral

umbilical

umbilicate umbilicated