sole1
  
  n.
   - the underside of a person's foot. 
▸the section forming the underside of a piece of footwear.
 - the underside of a tool or implement, e.g. a plane or the head of a golf club.
 - the floor of a ship's cabin or cockpit.
 
v.
 put a new sole on (a shoe).
 
  Derivative
  
  Etymology
  ME: from OFr., from L. solea ‘sandal, sill’, from solum ‘bottom, pavement, sole’.
 
  
    
sole2
  
  n.
 (pl. same)
 an edible marine flatfish. 
[Several species in the families Soleidae, Pleuronectidae, and Bothidae.]
 
  Etymology
  ME: from OFr., from Provençal sola, from L. solea (see sole1), named from its shape.
 
  
    
sole3
  
  adj.
  - one and only. 
▸belonging or restricted to one person or group.
 - archaic (especially of a woman) unmarried. 
▸alone.
 
 
  Etymology
  ME: from OFr. soule, from L. sola, fem. of solus ‘alone’.