||My`co*der"ma (?), n. [NL., from Gr.
my`khs a fungus + de`rma skin.]
1. (Biol.) One of the forms in which
bacteria group themselves; a more or less thick layer of motionless
but living bacteria, formed by the bacteria uniting on the surface of
the fluid in which they are developed. This production differs from
the zoöglœa stage of bacteria by not having the
intermediary mucous substance.
2. A genus of microörganisms of which
the acetic ferment (Mycoderma aceti), which converts alcoholic
fluids into vinegar, is a representative. Cf.
Mother.