A gripping hand tool with two hinged arms and (usually) serrated jaws WordNet 3.0 & Open English WordNet

Pliers are a hand tool used to hold objects firmly, possibly developed from tongs used to handle hot metal in Bronze Age Europe. Wikipedia

Tool with two legs, can fix or modify a workpiece Wikidata

A type of slip-joint pliers with serrated jaws generally set 45– to 60-degrees from the handle, in which the lower jaw can be moved to a number of positions by sliding along a tracking section under the upper jaw, to create different jaw spans. OmegaWiki

A gripping tool that multiplies the strength of the user's hand. OmegaWiki

A pincer-like gripping tool that multiplies the strength of the user's hand, often used for bending things. Wiktionary

Gripping tool which multiplies the strength of the user's hand. Wiktionary (translation)