Englishfor English speakers
midline
—
noun
(= midplane)
the median plane of the body (or some part of the body)
deviation
Noun
—
A deviation is difference or movement away from a standard.
They insist that there must be no deviation from that style.
Any deviations from the contract would have to be agreed by both parties.
—
A deviation is the difference between a number and the average of a set of values.