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.
Origin: From triad-, stem of trias, from ÏÏÎ¹Î¬Ï; applied by British authorities to underground society in Hong Kong based on geometry of Chinese character. Webster Dictionary (0.00 / 0 votes) Rate this definition: Triad (noun) a union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities. Triad (noun) a chord of three notes. Triad (noun) the common chord, consisting of a tone with its third and fifth, with or without the octave. Triad (noun) an element or radical whose valence is three