noun, Plant Pathology.
a limited, often circular, discolored, diseased area on a leaf, usually including a central region of necrosis.
any disease so characterized.
any of various plant diseases, usually caused by fungi: characterized by dark lesions on the leaves
Any of various plant diseases resulting in well-defined necrotic areas on the leaves.
noun 1. a long, narrow, multiple spring composed of several layers of spring metal bracketed together: used in some suspension systems of carriages and automobiles. noun 1. one of a number of metal strips bracketed together in length to form a compound spring 2. the compound spring so formed
- Lead balloon
noun phrase unwelcome situation; a failure or unsuccessful situation Examples His suggestion to stay put went over like a lead balloon. noun phrase A dismal failure; flop: His run for office was a lead balloon (1940s+) Related Terms go over like a lead balloon
[led] /lɛd/ noun, Chemistry. 1. a highly toxic, colorless crystalline compound, Pb(N 3) 2 , that detonates at 660°F (350°C) and is used as a detonator for explosives.
- Leaf vegetable
noun any plant whose leaves are eaten as a vegetable, as cabbage, lettuce, spinach, endive, and cress; also called leafy greens Examples Leaf vegetables are a diverse and eclectic group of plants comprising several different taxonomic plant families. Usage Note cooking