Definition. 1  A lumpectomy is a type of surgery used to treat breast cancer. It is considered breast-conserving surgery because in a lumpectomy, only the malignant tumor and a surrounding margin of normal breast tissue are removed. 2  Lumpectomy is a surgical treatment for newly diagnosed breast cancer. It is estimated that at least 50% of women with breast cancer are good candidates for this procedure. The location, size, and type of tumor are of primary importance when considering breast cancer surgery options.
A triadic melody is a melody made up of triads. Triads are chordsconsisting of three tones. The triad consists of the root tone, amajor or minor.
Wiktionary(0.00 / 0 votes)Rate this definition: triad(Noun) A grouping of three. triad(Noun) A chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale. triad(Noun) on a CRT display, A group of three neighbouring phosphor dots, coloured green, red, and blue.