Col
An exposed pass in a mountain range.

Cwm
A Welsh word for high valley. In the case of Everest, it is the high valley formed by the west shoulder of Everest, Lhotse and Nuptse.

Dhal Bhaat Tarkaari
The traditional Nepali meal: Dhal (lentil soup); Bhat (cooked rice); Tarkari (vegetables)

Dudh
As in "Dudh Kosi", the main river of the Khumbu. Dudh literally means "milk."

Firn snow
Old snow changing into ice.

Gamow bag
A portable hyperbaric body bag with an airtight zipper that, when inflated with a foot pump, increases the pressure inside, resulting in a drop in altitude to the patient — a potential lifesaver to someone needing to descend immediately to a lower altitude/elevation, but unable to get there.

Glissade
A descending technique in which climbers slide down a slope either on their feet, as with skiing, or on their buttocks in a sitting position.

Hypothermia
A pathologic reduction of body temperature; climbers risk hypothermia because of exhaustion and the severe environment at altitude. Symptoms include impaired judgment, clumsiness, slurred speech, weakness and progressive mental impairment. In severe cases, victims lose consciousness and suffer heart dysfunction.

Hypoxia
Lack of oxygen.