[alt] 
Music.| 1. | high. |
| 2. | in alt, in the first octave above the treble staff. |
| either of two keys on a PC keyboard that is held down while pressing another key, as to perform a specific operation or type a special character. |
| alt (ālt) adj. Pitched in the first octave above the treble staff; high. n.
[Latin altus, high; see al-2 in Indo-European roots.] |
ALT (ā'ěl-tē')
n.
Alanine aminotransferase; an enzyme in serum and body tissues that catalyzes the transfer of amino acid groups from l-alanine to 2-ketoglutarate or the reverse, thus allowing nitrogen to be excreted or incorporated into other compounds.
