1. (a.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
2. (n.) Any fish having placoid scales, as the sharks.
3. (n.) One of the Placoides.
| Placoid 1. (a.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids. 2. (n.) Any fish having placoid scales, as the sharks. 3. (n.) One of the Placoides. | |