[1] : The Collaborative International Dictionary of English v.0.48

tonguing \tongu"ing\, vb. n. music
   modification of tone for a rapid staccato effect by the
   performer's tongue, in playing a wind instrument, as a flute.
   in single tonguing only one kind of stroke is used, the
   tongue articulating a rapid "t;" in double tonguing, two
   strokes, as for "t" and "k," are alternated; in triple
   tonguing, "t, k, t," etc.
   webster 1913 suppl.
see also:
single tonguing double tonguing triple tonguing 

Tonguing >> T Words
Tonguing, definition of term: Tonguing
tonguing_pag1.html

Triple >> T Words
Triple, definition of term: Triple
triple_pag1.html

Triple Sec >> T Words
Triple Sec, definition of term: Triple Sec
triple+sec_pag1.html