simar noun3 •A type of ecclesiastical vestment, similar to a cassock. •(no longer used, historical) A woman's loose, long dress or robe; sometimes specifically, an undergarment or chemise.[T]heir beautiful tresses were braided and incensed; and they were wrapped in symars whiter than alabaster. — 1786 •(no longer used) A light covering; a cloak or mantle. formssimars