#base.underside  a flat bottom on which something is intended to sit; "a tub should sit on its own base"
  part of:  #box  #lamp.article_of_furniture  #vessel
  supertype:  #underside__bottom__undersurface  the lower side of anything
     supertype:  #side.surface__face  a surface forming part of the outside of an object; "he examined all sides of the crystal"; "dew dripped from the face of the leaf"
        supertype:  #surface.bounds  the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface"
           supertype:  #bounds__boundary  the line or plane indicating the limit or extent of something
              supertype:  #extremity.region  the outermost or farthest region or point
                 supertype:  #region.location__part  the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
                    supertype:  #location  a point or extent in space
                       supertype:  pm#space  point or extent in space
                          supertype:  pm#spatial_object__spatialobject  object which as a direct spatial location, e.g., physical object, spatial region or shape
                             supertype:  sumo#object__entity_with_spatial_feature  spatial object (space, location or physical object) or description medium/container (e.g., string, language, image); in a 4D ontology, an object is something whose spatiotemporal extent is thought of as dividing into spatial parts roughly parallel to the time-axis
                                supertype:  pm#entity  something that can be "involved" in a situation
                                   supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                                supertype:  sumo#physical__physical_thing  an entity that has a location in space-time; locations are themselves understood to have a location in space-time; click here for more details on the identical category sowa#physical_thing
                                   supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                             supertype:  cyc#partially_tangible__partiallytangible  A subcollection of cyc#SpatialThing-Localized and cyc#TemporalThing. Each instance of cyc#PartiallyTangible has a tangible (i.e. material) part and a temporal extent (i.e. it exists in time). It might or might not also have an intangible part. For example, a particular copy of a book is made of matter, has temporal extent, and also has an intangible part: the information content of the text markings on its pages.
                                supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                             supertype:  pm#individual__particular___supertype_of_1st_order_types  all individuals (for concepts or relations) are implicitely or explicitely instance of that type
                                supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

No statement uses or specializes #base.underside; click here to add one.