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tugboat

(Encyclopedia)tugboat, small, strongly built vessel, used to guide large oceangoing ships into and out of port and to tow barges, dredging and salvage equipment, and disabled vessels. Tugboats range in overall leng...

copper, chemical element

(Encyclopedia)copper, metallic chemical element; symbol Cu [Lat. cuprum=copper]; at. no. 29; at. wt. 63.546; m.p. 1,083.4℃; b.p. 2,567℃; sp. gr. 8.96 at 20℃; valence +1 or +2. Copper and some of its alloys ha...

Lamesa

(Encyclopedia)Lamesa ləmēˈsə [key], city (1990 pop. 10,809), seat of Dawson co., NW Tex., in the Llano Estacado; inc. 1917. Lamesa is a processing and shipping center for an irrigated area where cattle and hogs...

electrophorus

(Encyclopedia)electrophorus, device used to generate static electric charges. It has two parts: a nonconducting plate (e.g., of hard rubber) that is negatively charged and a metal plate with an insulated handle. A ...

Atsugi

(Encyclopedia)Atsugi ätˌso͞oˈgē [key], city, Kanagawa prefecture, E central Honshu, Japan, on the Sagami River. It is an important communication, commercial, and agricultural cente...

Galion

(Encyclopedia)Galion gălˈyən [key], city (2020 pop. 10,453), Crawford co., N central Ohio; inc. as a bor...

Irvine, town, Scotland

(Encyclopedia)Irvine ûrˈvĭn [key], town, North Ayrshire, SW Scotland, on the Irvine River estuary. Indus...

cathode

(Encyclopedia)cathode, electrode through which current leaves an electric device. In electrolysis, it is the negative electrode in the electrolytic cell. ...

ray, in zoology

(Encyclopedia)ray, extremely flat-bodied cartilaginous marine fish, related to the shark. The pectoral fins of most rays are developed into broad, flat, winglike appendages, attached all along the sides of the head...