clypeasteroid
Word Rarity
Very rare
Frequency: Zipf frequency 0.00 in modern English
21
Scrabble Score
13
Letters
3
Syllables
12
Unique Chars
Meaning
noun
Any echinoderm of the order Clypeasteroida of sand dollars.
Example Sentences
- "Their living representatives include the sea urchins or 'true' echinoids, the heart-urchins or spatangoids and allied forms, the sand-dollars or clypeasteroids, and the slate-pencil-urchins, or cidaroids."
- "At ordinal levels, in cassiduloids and holectypoids, ambitus is circular, elliptical or oval, while clypeasteroids have a pentagonal to circular type."
- "Their traditional taxonomy, based on skeletal characters, has been largely corroborated by recent molecular phylogenetic analyses with one marked exception: clypeasteroids are not found to be monophyletic."