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plural matrasses
(obsolete) A bolt for a crossbow.
(now rare) A type of bolthead flask used in chemical distillation. quotations
So the learn'd Alchemist exulting sees / Rise in his bright matrass Dɪᴀɴᴀ's trees […] .
1791, Erasmus Darwin, The Economy of Vegetation, J. Johnson, page 206