The diseases have been categorized as patches (cause dead spots or patches in the lawn), rings (cause rings of dead or affected grass), or leaf blight (affect individual blades of grass, often over a wide area and no distinct patch or ring pattern may be noticeable).
PVR, abbreviation for pulmonary vascular resistance. To measure changes in blood vessel size or changes in gas volume in the lungs to assist in diagnosing diseases such as deep vein thrombosis (DVT), chronic obstructive pulmonary disease (COPD), and some peripheral vascular disorders. Veins, arteries, and lungs. None.
Definition of VCR for English Language Learners. : a machine that is used to make and watch video recordings of television programs, movies, etc. See words that rhyme with VCR Spanish Central: Translation of VCR Nglish: Translation of VCR for Spanish speakers Britannica English: Translation of VCR for Arabic speakers Britannica.com: Encyclopedia article about VCR.