The term THYROID NEED can be solved by the crossword solution IODINE, which is a chemical element with the symbol I and atomic number 53. It is a halogen that occurs naturally in the form of iodide salts. Iodine is an essential trace element for the production of thyroid hormones, which are important for normal growth and development. Therefore, the term THYROID NEED can be interpreted as a need for iodine in order to maintain healthy thyroid function.