copepods Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. Small crustaceans found in the sea and nearly all freshwater habitats. Example Sentence Copepods are a group of small crustaceans found in the sea and nearly every freshwater habitat. Synonyms plankton; krill; water fleas Antonyms whale; shark Hear It! Say It! Write It! copepods Switch to cursive Start Share with your friends: