TUNNELLING
\tˈʌnəlɪŋ], \tˈʌnəlɪŋ], \t_ˈʌ_n_ə_l_ɪ_ŋ]\
Definitions of TUNNELLING
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2010
- New Age Dictionary Database
By Oddity Software
1913
- Webster's Revised Unabridged Dictionary
By Noah Webster.
1871
- The Cabinet Dictionary of the English Language