synclitic

\(ˈ)si]n]|klid.ik, sə]n]ˈk-, ]ŋ]\ adjective

Etymology: from (assumed) Greek synklitos (verbal of Greek synklinein to lean together, from syn- + klinein to lean) + English -ic — more at lean

: parallel to the axis of the pelvis — used of the planes of the fetal head in labor; compare enclitic