Webster's English Dictionary

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tunnel

1. tun.nel \'t*n-*l\ \-*l-.(l)i-k\ n [ME tonel tube-shaped net, fr. MF, 
   tun, fr. OF, fr. tonne tun, fr.]ML tunna, of Celt origin; akin to MIr tonn 
   skin, hide; akin to L tonde-re to shear - more at TOME 1: a hollow conduit 
   or recess : TUBE, WELL  2a: a covered passageway; specif : a horizontal 
   passageway through  or under an obstruction 2b: a subterranean gallery (as 
   in a mine)  2c: BURROW  - tun.nel.like aj
2. tunnel \'t*n-lin, -*l-in\ \'t*n-l*r, -*l-*r\ vb or tun.neled or 
   tun.nelled;  or tun.nel.ing;  or tun.nel.ling : to make a tunnel or similar 
   opening through or under  : to make or use a tunnel  - tun.nel.er n