from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The small, free-swimming, ciliated aquatic larva of various invertebrates, including certain mollusks and annelids.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The free-swimming larva of some invertebrates that have a circlet of cilia
from The Century Dictionary and Cyclopedia
- n. A larval type found in many invertebrates and exhibiting many points of resemblance to an adult trochelminth or rotifer. Also termed trochosphere.
Greek trokhos, wheel (from trekhein, to run) + -phore.(American Heritage® Dictionary of the English Language, Fourth Edition)