bolthead C2+ Topic:Places & Geography US /ˈboʊltˌhɛd/ UK /ˈbəʊltˌhɛd/ See IPA manual Freq #1142082 Meanings 1 noun the enlarged head of a bolt, shaped to be turned or to hold the bolt in place The mechanic placed the wrench firmly around the bolthead. 2 noun historical chemistry: a round-bottomed glass flask with a long neck; a matrass The chemist heated the solution gently in a glass bolthead. Thesaurus Synonyms 1 noun · the enlarged head of a... bolt head 2 noun · historical chemistry: a... matrass Word family Derived forms boltheads Related forms boltflask Etymology A compound of bolt + head. The mechanical sense is transparent; the historical laboratory sense named a long-necked flask whose rounded body suggested a bolt head. Topics Places & Geography Register & Style External links Google Images Cambridge Dictionary Wiktionary # bolthead **Type:** Word **Level:** C2+ **Part of speech:** noun **IPA (US):** /ˈboʊltˌhɛd/ **IPA (UK):** /ˈbəʊltˌhɛd/ **Frequency rank:** 1142082 ## Meanings 1. the enlarged head of a bolt, shaped to be turned or to hold the bolt in place 2. historical chemistry: a round-bottomed glass flask with a long neck; a matrass ## Examples - The mechanic placed the wrench firmly around the bolthead. - The chemist heated the solution gently in a glass bolthead. ## Synonyms - bolt head - matrass ## Derived Forms - boltheads ## Related Forms - bolt - flask ## Etymology A compound of bolt + head. The mechanical sense is transparent; the historical laboratory sense named a long-necked flask whose rounded body suggested a bolt head. ## Topics - Places & Geography - Register & Style markdown