raiae

from The Century Dictionary.

• An order or suborder of selachians, comprising the rays or skates, and distinguished by the position of the branchial apertures on the lower surface of the body, and the depressed and disk-like trunk in combination with the outspread pectorals. Also called Batoidei.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) The order of elasmobranch fishes which includes the sawfishes, skates, and rays; -- called also Rajæ, and Rajii.