thyromegaly Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the die Example Sentence She took medicine for thyromegaly. Synonyms goiter; struma; enlarged thyroid gland Antonyms small thyroid gland Hear It! Say It! Write It! thyromegaly Switch to cursive Start Share with your friends: