Related Clues:

• Element in colemanite
• Mother-of-pearl
• Scrape treatment
• Goiter treatment
• Seaweed product
• Least active of the halogens
• First-aid item
• Medicine cabinet item
• Thyroid treatment
• Heads-up
• Hypothyroidism preventer
• Seaweed extract
• Element number five
• Natural semiconductor
• The fifth element