Vin'e-gar-plant, n.

n. (Bot.) A minute plant of the genus Ulvina (U. aceti or Mycoderma aceti of some authors), known also as mother of vinegar. It consists of a layer of very minute granules which grow in a branch-like form. When immersed in a solution of sugar or treacle, it soon converts the liquid into vinegar. Baird.