Acetabulum
Romans often drank a mixture of vinegar and water and had a special container for this called an acetabulum. This is from the Latin acetum (vinegar) and abulum the suffix denoting a small vessel. Today the word is used only as a medical term to describe the cup-like shape in your hip that the thigh bone sits in. Usually made of pottery, some in the first Century, as in this example were made of glass and often found in Italian graves. Below are three examples.
ROMAN COBALT BLUE ACETABULUM
ACETABULUM
ROMAN GLASS CUP (ACETABULUM)
61R Small cup (acetabulum) 1st Century