#midpoint__center__centre  a point equidistant from the ends of a line or the extremities of a figure
  supertype:  #point  the precise location of something; a spatially limited location; "she walked to a point where she could survey the whole street"
  subtype:  #bight  the middle part of a slack rope (as distinguished from its ends)
  subtype:  #center_of_curvature__centre_of_curvature  the center of the circle of curvature
  subtype:  #bowels  the center of the Earth
  subtype:  #bull's_eye.midpoint__bull'seye__bull  the center of a target
  subtype:  #centroid__center_of_mass  point representing the mean position of the matter in a body
     subtype:  #barycenter  (astronomy) the common center of mass around which two or more bodies revolve
  subtype:  #center_of_gravity__centre_of_gravity  the point within something at which gravity can be considered to act
  subtype:  #storm_center.midpoint__stormcenter__storm_centre__stormcentre  the central area or place of lowest barometric pressure within a storm
  subtype:  #core  the center of an object; "do not eat the apple core"
     subtype:  #corncob  the hard cylindrical core that bears the kernels of an ear of corn
  subtype:  #navel_point__navel  the center point or middle of something
  subtype:  #nombril  the center point on a shield
  subtype:  #core.midpoint  the central part of the earth
  subtype:  #nucleus__nucleu  the positively charged dense center of an atom
  subtype:  #nucleus.midpoint__nucleu  (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

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