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Related to soft solder: hard solder
soft solder[′sȯft ′säd·ər]
Solder composed of an alloy of lead and tin. Also known as low melting solder.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A low-melting-point solder.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.