Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of chaetognath is as below...

Chaetognatha :: Chaetognatha (n. pl.) An order of free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head..

Chaetognath :: Chaetognath (a.) Of or pertaining to the Chaetognatha.

Sagitta :: Sagitta (n.) A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of the class Chaetognatha..

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