The Collaborative International Dictionary
Placoid \Plac"oid\, a. [Gr. pla`x, plako`s, a tablet + -oid.] (Zo["o]l.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.
Placoid \Plac"oid\, n. (Zo["o]l.)
Any fish having placoid scales, as the sharks.
One of the Placoides.
Wiktionary
a. platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids. n. Any fish having placoid scales, such as the sharks.
WordNet
adj. as the hard flattened scales of e.g. sharks [syn: platelike]
Usage examples of "placoid".
To his astonishment, he perceived that they were prostrating themselves before him, all save one, dressed as it seemed in a robe of placoid scales, and crowned with a luminous diadem, who stood with his reptilian mouth opening and shutting, as though he led the chanting of the worshippers.