embryos Get Printable Handwriting Watch Say It Video Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. early stages of development in living organisms. Example Sentence The scientist carefully studied the embryos under the microscope. More Example Sentences Scientists study embryos to learn about growth. Synonyms fetuses; zygotes; preborns Antonyms adult; mature organism Hear It! Say It! Write It! embryos Switch to cursive Start Share with your friends: Watch Say It Video