por·ta·men·to (pôr'tə-měn'tō, pōr'-) n.
pl.por·ta·men·ti (-tē) or por·ta·men·tos A smooth uninterrupted glide in passing from one tone to another, especially with the voice or a bowed stringed instrument.
[Italian, from portare, to carry, from Latin portāre; see per-2 in Indo-European roots.]