1. An egg-shaped chemical vessel, with a tapering neck, and open at the top.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• matresss,
• matras,
• matress,
• matres,
• matra,
• matris,
• martress,
• mattress,
• natrass,
• katrass,
• jatrass,
• mztrass,
• mstrass,
• mwtrass,
• mqtrass,
• marrass,
• mafrass,
• mayrass,
• ma6rass,
• matrees

The plural of the "Matrass" can be the "matrasses".

The singular of the "Matrass" can be the "Matrass".