Plain English Meaning

Having low blood sugar, which can make a person feel weak, shaky, confused, or even faint. For a pilot, this is dangerous because it affects thinking and reactions in the cockpit.

Full Definition

Relating to or experiencing an abnormally low level of glucose (sugar) in the blood. In aviation medical contexts, a hypoglycemic state can impair judgment, vision, coordination, and consciousness, and is a recognized hazard to safe flight.

Context Anchor

Seen in FAA medical certificate discussions, especially when a medical condition or medication could affect a pilot’s ability to operate safely.

Derivation

From Greek hypo- meaning 'under' or 'below,' and glykys meaning 'sweet,' with -emic referring to the blood. Literally 'low sweetness in the blood' — i.e., low blood sugar.