2010: "stromuhr"
Per Merriam-Webster, it is "a rheometer designed to measure the amount and speed of blood flow through an artery."
Spelling this word correctly won Anamika Veeramani, from Cleveland, Ohio, the national championship trophy in 2010.
2007: "serrefine"
Per Merriam-Webster, it is "a small forceps for clamping a blood vessel."
Spelling this word correctly won Evan M. O'Dorney, from Walnut Cree, Calif., the national championship trophy in 2007.
2001: "succedaneum"
Per Merriam-Webster, it is a substitute, often in reference to medicines or drugs. Moreover, "Caput succedaneum" is "an edematous swelling formed under the presenting part of the scalp of a newborn infant as a result of trauma sustained during delivery."
Spelling this word correctly won Sean Conley, from Aitkin, Minn., the national championship trophy in 2001.
1995: "xanthosis"
Per Merriam-Webster, it is a "yellow discoloration of the skin from abnormal causes."
Spelling this word correctly won Justin Tyler Carroll, from Memphis, Tenn., the national championship trophy in 1995.