n 1 a  :  a piece of material (as an adhesive plaster) used medically usu. to cover a wound, repair a defect, or supply medication through the skin - see PATCH GRAFT   b  :  a shield worn over the socket of an injured or missing eye  2  :  a circumscribed region of tissue (as on the skin or in a section from an organ) that differs from the normal color or composition <sometimes great white es develop on the tongue, the cheeks, and the gums -Morris Fishbein>  patch vt patchy adj patch*i*er  -est  
 
 
 
Similar sounding terms:  pe·te·chia   pitch  pot·ash 
 
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