Sentence:  Angels and Archangels / May have gathered there, / <WSD>Cherubim</WSD> and Seraphim / Thronged the air; / But only His Mother / In her maiden bliss / Worshiped the Beloved / With a kiss. 
Meaning of the word marked with <WSD> tags:  A winged creature attending on God, described by (Pseudo-Dionysius the Areopagite) ((short=yes)) as the second highest order of angels, ranked above thrones and below seraphim; similar to a lamassu in the pre-exilic texts of the Hebrew Bible, more humanoid in later texts.