Why was "tantrum" trending last week?
"middle, median," 1803, an irregular formation from Greek mesos "middle" (see meso-) + -al (1). Related: Mesially.
mesial me·si·al (mē'zē-əl, -zhəl)adj.
Of, in, near, or toward the middle.
Situated toward the middle of the front of the jaw along the curve of the dental arch.