being connected at a fundamental level;  having an unseen commonality;  underlying (both)
 bottom of one's heart;  depths of one's mind;  innermost thoughts;  real intentions
 base (e.g. of a triangle);  low class;  low in social standing;  base (e.g. of support);  foundation
 palm heel;  heel of the palm
 original text;  source book;  draft
 bottom current;  undercurrent
 planta;  planta pedis;  sole of the foot
 well bottom;  narrow place
 orbital floor (thin bone floor of eye socket)
 pelvic floor muscle;  pubococcygeal muscle;  Kegel muscle
 benthic organism;  sea-bottom fauna;  benthos
 bottom water (depth: 4000+ meters)
 ocean floor;  sea floor;  seabed
 bottom material;  bed material;  sludge;  sediment;  substratum
 benthic animal;  benthonic animal;  zoobenthos
 phlegmon in floor of oral cavity;  Ludwig's angina