n. A transparent marine worm of the phylum Chaetognatha, found in plankton.
the GNU version of the Collaborative International Dictionary of English
n. A peculiar transparent worm of the genus Sagitta, living at the surface of the sea. See Sagitta.
The Century Dictionary and Cyclopedia
n. An animal of the genus Sagitta (which see).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth