Source : Webster's Revised Unabridged Dictionary (1913)

Tuba \Tu"ba\, n. [L., trumpet.] (Mus.)
   (a) An ancient trumpet.
   (b) A sax-tuba. See {Sax-tuba}.

Source : WordNet®

tuba
     n : the lowest brass wind instrument [syn: {bass horn}, {sousaphone}]
     [also: {tubae} (pl)]

Source : Free On-Line Dictionary of Computing

TUBA
     
         An {Internet} {protocol}, described in
        {RFC 1347}, {RFC 1526} and {RFC 1561}, and based on the {OSI}
        {Connectionless Network Protocol} (CNLP).
     
        TUBA is one of the proposals for {Internet Protocol Version
        6}.
     
        (1995-04-03)