noun
also mat·ras or mat·trass ˈma.trəs
( -es )
Etymology: French matras tall bottle, from Middle French, from matras arrow, from Latin matara javelin, from Gaulish; probably akin to Latin metiri to measure — more at measure
: a rounded glass flask with a long neck formerly used for dissolving substances by the application of heat or for distilling — called also bolt head