Definitions for ketosiskɪˈtoʊ sɪs
Random House Webster's College Dictionary
the accumulation of excessive ketone bodies in the blood and urine.
Origin of ketosis:
ketonemia, ketosis, acetonemia(noun)
an abnormal increase of ketone bodies in the blood as in diabetes mellitus
A metabolic state in which the body produces ketones to be used as fuel by some organs so that glycogen can be reserved for organs that depend on it. This condition occurs during times of fasting, starvation, or while on a ketogenic weight-loss diet.
U.S. National Library of Medicine
A condition characterized by an abnormally elevated concentration of ketone bodies in the body tissues and fluids. It is a complication of diabetes mellitus and starvation. (Dorland, 27th ed)
Ketosis is a state of elevated levels of ketone bodies in the body. It is almost always generalized throughout the body, with hyperketonemia, that is, an elevated level of ketone bodies in the blood. Ketone bodies are formed by ketogenesis when liver glycogen stores are depleted. The ketone bodies acetoacetate and β-hydroxybutyrate are used for energy.