15-Letter Words Containing: _,E,I,R,R,S,T

• an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones

• To crystallize again; especially as a means of purification.

• a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane

• the branch of chemistry that studies the relation between chemical action and the amount of heat absorbed or generated