Definition: Macroglossia refers to an abnormally large tongue. In children, it may be associated with Downs syndrome, glycogen storage disease, or congenital hypothyroidism. If large enough, the tongue may obstruct the airway and lead to sleep apnea.
Pronunciation: Mac-row-gloss-ee-uh
Examples: My son has macroglossia, and it makes it difficult for him to breathe.

