dreno

Dreno is a term used in Portuguese to refer to a drain or drainage channel, as well as to the drain terminal in electronics. The word originates from the verb dren ar (to drain) and is used in technical contexts to denote the outlet or passage through which liquids or electrical current exit a system.

In plumbing and civil engineering, a dreno is any conduit that carries water away from a surface, structure, or area. Drains can be surface channels, pipes, or grates connected to sewer or stormwater networks. Proper drainage design relies on adequate slope, appropriate cross-sections, and access for maintenance to prevent flooding, dampness, and related damage.

In agriculture, drainage practices use dreno channels, ditches, or tile drains to lower the water table and improve soil conditions for crops. Design considerations include soil type and permeability, slope, climate, and the expected rate of water removal, with regular maintenance to avoid clogging.

In electronics, the dreno is the drain terminal of a transistor, such as a MOSFET or JFET. It is the output node through which carriers leave the device, typically labeled D in schematics and positioned opposite the source (S). The drain voltage and current are governed by the device’s biasing and operating region.

See also: drainage, drenagem, esgoto, MOSFET, transistor.