placoid

1. Any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates. Vertebra is one of the bones of the backbone or spinal column.
   众多的软骨鱼类；以软骨骨架和板状鱼鳞为特征，包括鲨、鳐、灰鳐。脊椎骨是腰背骨或脊柱骨之ㄧ种骨头。
2. Any of numerous fishes of the class chondrichthyes, characterized by a cartilaginous skeleton and placoid scales and including the sharks, rays, and skates.
   属软骨鱼纲的鱼软骨鱼纲鱼的一种，以软骨骨架和板状鱼鳞为特征，包括鲨、鳐、灰鳐。
3. A study on patterns of placoid scales of sharks
   鲨鱼鳞片的研究

adj

1. as the hard flattened scales of e.g. sharks

   Synonym:    platelike