The photic zone

(climbing) Land at sufficiently high altitudes that there is not enough oxygen to sustain human life.

(physics) The stage in the flow or a fluid during which it changes from laminar to turbulent / (geology) The region between the upper and lower mantle characterized by a rapid increase in density

plural of zone defense

A region or context located in between others and therefore not subject to their norms. / (geography) A deteriorating area surrounding a central business district.

To put or place into an indeterminate position; to be in an ambiguous, undetermined, or improper context.

(figuratively) A region in which surreal, supernatural, or fantastic events occur.

(intransitive) To experience or perceive something bizarre or fantastic. / (intransitive) To behave or occur in a confusing or unexpected manner.

The area in which the baton must be passed from one runner to another during a relay race.

plural of zone plate