(adj): vs. abnormal) -- (conforming with or constituting a norm or standard or level or type or social norm; not abnormal
(adj): dividing an animal into right and left halves
(adj): vs. distal) -- (being in or directed toward the midline or mesial plane of the body
(adj): relating to or situated in or extending toward the middle
(adj): vs. peripheral) -- (in or near a center or constituting a center; the inner area
(n): the value below which 50% of the cases fall
(n): a statistic describing the location of a distribution
