| substernal | 1. Deep to the sternum. Synonym: infrasternal. (05 Mar 2000) |
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| substernal angle | The angle between the lower borders of the costal cartilages of the two sides as they approach the sternum. Synonym: angulus infrasternalis, substernal angle. (05 Mar 2000) |
| substernal goiter | Enlargement of the thyroid gland, chiefly of the lower part of the isthmus, palpable with difficulty or not at all. (05 Mar 2000) |
| goiter, substernal | An enlarged thyroid gland where the enlarged gland is situated beneath the sternum. (12 Dec 1998) |
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