mortress
/ˈmɔːtrɪs/noun
A kind of thick soup or pottage, usually made with meat or fish. Also used in the names of specific dishes. Now historical.
Origin
Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. From Middle French mortereus, mortereux, mortreux, mortereoux, plural of morterel, morteruel: see mortrel.