echinoidea
Word Rarity
Very rare
Frequency: Zipf frequency 1.02 in modern English
16
Scrabble Score
10
Letters
2
Syllables
8
Unique Chars
Meaning
The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid , Clypeastroid .