Filter flask, also known as a vacuum flask, is a flask with a side arm to which a vacuum can be applied. It usually have heavy side walls to withstand high vacuum.
Generalic, Eni. "Filter flask." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table