Depression: A mood disorder characterised by feelings of sadness, hopelessness, helplessness, and worthlessness. Sometimes physical symptoms such as slow movement and speech are also present.

 

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Depression: In meteorology, it is another name for an area of low pressure, a low, or trough. It also applies to a stage of tropical cyclone development and is known as a tropical depression to distingu . . . View Full Definition

Freezing Point Depression: The freezing point of a solution is always lower than the freezing point of the pure solvent. The freezing point depression is roughly proportional to the molality of solute particles in the . . . View Full Definition

Wet Bulb Depression: Dependent on the temperature and the humidity of the air, it is the difference between the dry bulb and the wet bulb readings.

Cone Of Depression: A cone-shaped lowering of the water table around a producing well.

Tropical Depression: A tropical cyclone in which the maximum sustained surface winds are 38 miles per hour (33 knots) or less. Characteristically having one or more closed isobars, it may form slowly from a trop . . . View Full Definition

Double Tide: A double-headed tide, that is, a high water consisting of two maxima of nearly the same height separated by a relatively small depression, or a low water consisting of two minima separated b . . . View Full Definition

Grassed Waterway: A generally broad and shallow depression planted with erosion-resistant grasses, which is used to convey surface waters off of or across cropland.

Chart Datum: The datum to which soundings on a chart are referred. It is usually taken to correspond to a low-water elevation, and its depression below mean sea level is represented by the symbol Z;. Sin . . . View Full Definition

Prairie Potholes: A type of wetland that is at the center of a shallow depression characteristic of glaciated areas in the Upper Midwest (North Dakota especially). Many potholes are wet during only a portion . . . View Full Definition

Molality: Concentration measured as moles of solute per kilogram of solvent. For example, a 1 m nacl solution contains 1 mole of nacl per kilogram of water. Molalities are preferred over molarities in . . . View Full Definition