The Collaborative International Dictionary of English v.0.48:

Humeral \Hu"mer*al\, a. [L. humerus the shoulder: cf. F.
   hum['e]ral.] (Anat.)
   Of or pertaining to the humerus, or upper part of the arm;
   brachial.
   [1913 Webster]

   Humeral veil (R. C. Ch.), a long, narrow veil or scarf of
      the same material as the vestments, worn round the
      shoulders by the officiating priest or his attendant at
      Mass, and used to protect the sacred vessels from contact
      with the hands.
      [1913 Webster]

WordNet (r) 3.0 (2006):

humeral veil
    n 1: a vestment worn by a priest at High Mass in the Roman
         Catholic Church; a silk shawl [syn: humeral veil, veil]