Noun
(botany) Abbreviation of cultivar.
(botany, avoided) Abbreviation of convariety.
Synonym: convar.
Thus, if secondary stress would fall on a light (CV.) syllable, with a heavy (CVV. or CVC.) syllable following, then the secondary stress is moved one syllable to the right, and the preceding foot (syllable group) will contain three syllables. Source: Internet