Breadcrumb Home > Dictionary > Index C collar rot: Meaning and Definition of Find definitions for: col'lar rot" Pronunciation: [key] — Plant Pathol. Plant Pathol. a disease of plants, characterized by cankers that girdle the stem, caused by any of several fungi, as Alternaria solani. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. collar point collat. TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language