D defs.my
Entry 1 sense Webster, 1913

Portamento

· Por·ta·men·to · IPA /pɔːtəˈmɛntəʊ/
01 n. In singing, or in the use of the bow, a gradual carrying or lifting of the voice or sound very smoothly from one note to another; a gliding…
  1. 1.
    In singing, or in the use of the bow, a gradual carrying or lifting of the voice or sound very smoothly from one note to another; a gliding from tone to tone.(Mus.)