Adjustable wrench for gripping and turning a pipe; has two serrated jaws that are adjusted to grip the pipe WordNet 3.0 & Open English WordNet

A pipe wrench is any of several types of wrench that are designed to turn threaded pipe and pipe fittings for assembly or disassembly. Wikipedia

Adjustable wrench used for turning soft iron pipes and fittings with a rounded surface Wikidata

An adjustable wrench (British: spanner) with a toothed jaw for gripping pipe, frequently used by a plumber or pipe fitter, to loosen and tighten pipes with threaded connections, designed such that any forward pressure on the handle tends to pull the jaws (otherwise slightly mobile in the tool plan) tighter together. OmegaWiki

An adjustable wrench (British spanner) with a toothed jaw for gripping pipe, frequently used by a plumber or pipe fitter, to loosen and tighten pipes with threaded connections. Wiktionary

Adjustable wrench. Wiktionary (translation)