#groove__channel  a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)
  supertype:  depression.concave_shape__impression__imprint  a concavity in a surface produced by pressing; "he left the impression of his fingers in the soft mud"
  subtype:  dado  a rectangular groove cut into a board so that another piece can fit into it
  subtype:  flute  a groove or furrow in cloth etc especially the shallow concave groove on the shaft of a column
  subtype:  quirk  a narrow groove beside a beading
  subtype:  rabbet__rebate  a rectangular groove made to hold two pieces together
  subtype:  track.groove  a groove on a phonograph recording
  subtype:  rut  a groove or furrow (especially one in soft earth caused by wheels)
  subtype:  stria__striation  any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue

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