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ShellExecute(handle,'open',PChar('http://dict.leo.org/ende?lp=ende&lang=de&searchLoc=0&cmpType=relaxed§Hdr=on&spellToler=on&search=' + Wort + '&relink=on'),nil,nil,sw_showNOrmal)                    

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,shellapi, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  const                 
firstString:string='http://dict.leo.org/ende?lp=ende&lang=de&searchLoc=0&cmpType=relaxed§Hdr=on&spellToler=on&search=';
      secondString:string='&relink=on';
  var 
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
shellexecute(application.Handle,'open',pchar(firststring+edit1.Text+secondString),nil,nil,sw_shownormal);
end;

end.