(aviation) The airspace above the transition altitude but below the transition level.

plural of transition layer

Alternative form of L2TP

Alternative form of L2TP

plural of plexiform layer

plural of layer-cake

A surname from French.

(intransitive) To put on several layers of clothing. / (transitive) To stack upwards in layers; to overlay repeatedly.

(oceanography) A layer of the ocean lying usually 300-500 metres deep composed of dense concentrations of pelagic animal life, that moves depending on the time of day, up at night and down during the day. It sometimes appear as if it were the seabed on sonar scopes, due to the density of life in the layer.