n. A six-winged angel; the highest choir or order of angels in Christian angelology, ranked above cherubim, and below God. A detailed description can be found at the beginning of Isaiah chapter 6
the GNU version of the Collaborative International Dictionary of English
n. One of an order of celestial beings, each having three pairs of wings. In ecclesiastical art and in poetry, a seraph is represented as one of a class of angels.
The Century Dictionary and Cyclopedia
n. One of the celestial beings described in Isaiah vi. 1–6 as surrounding the throne of Jehovah.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an angel of the first order; usually portrayed as the winged head of a child
Word Usage
"In among the swirls of blackness, she could see the bright flashes of weapons, the Shadowhunters brandishing the brilliant white daggers Tessa knew now were called seraph blades, each one brought into shimmering life by the name of an angel."