1) Midline 2) Plane 3) Sheet 4) The median plane of the body 1) Midline 
Synonym for pelvic plane of least dimensions ... The plane that extends from the end of the sacrum to the inferior border of the pubic symphysis; it is bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the inferior border of the pubic symphysis. ... Synonym: midplane, plane of least pelvic dimensions, ...
Plane that is equidistant from both surfaces of the laminate.
Type: Term Pronunciation: mid′plān Synonyms: pelvic plane of least dimensions
[n] - the median plane of the body (or some part of the body)
midline noun the median plane of the body (or some part of the body)