from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See dietetics.
from the GNU version of the Collaborative International Dictionary of English
- n. A treatise on the regulation of the diet; dietetics.
from The Century Dictionary and Cyclopedia
- n. That department of medicine which relates to the regulation of diet; the doctrine or consideration of aliments; dietetics.
Greek sītos, food, grain + -logy.(American Heritage® Dictionary of the English Language, Fourth Edition)