What is the X in X-mas?
1680s, "pertaining to the scapula," from Modern Latin scapularis, from Latin scapula "shoulder" (see scapula). The noun (late 15c., also in Old English) in reference to a short cloak for the shoulders prescribed for certain monks, is from Medieval Latin scapulare, from scapula. Related: Scapulary.
scapular scap·u·lar (skāp'yə-lər) or scap·u·lar·y (-lěr'ē)
Of or relating to the shoulder or scapula.