Placoid is a 7 letter English word. It's valid Scrabble word worth 12 points. It's valid Words with friends word worth 15 points.
You can make 222 anagrams from letters in placoid (acdilop).
1835-45; Greek plak- (stem of pláx) something flat, tablet + -oid
The teeth of Selachii are fundamentally identical with placoid scales.
In the groups of fishes above the Selachians, the coating of placoid elements shows various modifications.
In the Selachians the bony skeleton is restricted to the placoid elements.
The most primitive form of the first type of dermal structures is that of the placoid scales of Elasmobranchii.
The Thornback Skate is covered with prickles (placoid scales).
In some cases the placoid scales are enlarged to form plates or spines capped or coated with enamel.