What is the definition of a manta?

1. (in Spain and Spanish America) a cloak or wrap. 2. the type of blanket or cloth used on a horse or mule. 3. Military. a movable shelter formerly used to protect besiegers, as when attacking a fortress. 4. Ichthyology. Also called manta ray, devil ray, devilfish. any of several tropical rays of the small family Mobulidae, esp. of the genus Manta, measuring from 2 to 24 ft. (0.6 to 7.3 m) across, including the pectoral fins.