in antiquity, a measure used by the ancients, equal to one-eighth of our pint. It seems to have acquired its name from a vessel in which acetum or vinegar was brought to their tables, and probably contained about this quantity.

in anatomy, a cavity in any bone for receiving the protuberant head of another, and thereby forming that species of articulation called emer-thrust. See Anatomy, p. 2, c.

in botany, the trivial name of a species of the peziza, or cup-peziza, a genus belonging to the cryptogamia fungi of Linneus. It has got the name of acetabulum, from the resemblance its leaves bear to a cup. See Peziza.