Original: A goitre or goiter (Latin gutteria, struma), is a swelling in the thyroid gland, which can lead to a swelling of the neck or larynx (voice box).
Simplified: A goitre (BrE), or goiter (AmE) (Latin struma), also called a bronchocele, is a swelling in the neck (just below Adam's apple or larynx) due to an enlarged thyroid gland.