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Austral Islands

(Encyclopedia)Austral Islands ôˈstrəl [key], volcanic island group, South Pacific, part of French Polynesia. They are sometimes known as the Tubuai Islands. The group comprises ...

ulcer

(Encyclopedia)ulcer, open sore or circumscribed erosion, usually slow to heal, on the skin or mucous membranes. It may develop as a result of injury; because of a circulatory disturbance, e.g., in varicose veins or...

Donetsk

(Encyclopedia)Donetsk dənyĕtskˈ [key], city, capital of Donetsk region, E Ukraine, on the Kalmius River. ...

tendril

(Encyclopedia)tendril, slender, sensitive structure of many climbing plants that by a response to contact (see auxin) supports the plant. Tendrils are modified stems, leaves, or leaf parts or roots. Most young tend...

Pôrto Alegre

(Encyclopedia)Pôrto Alegre pōrˈto͝o əlĕˈgrə [key], city (1991 pop. 1,263,403), capital of Rio Grande do Sul state, SE Brazil, on the Guaíba River. One of the chief industrial and commercial centers of Braz...

growing season

(Encyclopedia)growing season, period during which plant growth takes place. In temperate climates the growing season is limited by seasonal changes in temperature and is defined as the period between the last killi...

spraying

(Encyclopedia)spraying, horticultural practice of applying fungicides, insecticides, and herbicides, usually in solution, to plants. It may be accomplished by various means, e.g., the watering can, sprinkler attach...

cotyledon

(Encyclopedia)cotyledon kŏtˌəlēdˈən [key], in botany, a leaf of the embryo of a seed. The embryos of flowering plants, or angiosperms, usually have either one cotyledon (the monocots) or two (the dicots). See...

salmonellosis

(Encyclopedia)salmonellosis sălˌmənĕlōˈsĭs [key], any of a group of infectious diseases caused by intestinal bacteria of the genus Salmonella, including typhoid fever, paratyphoid fever, blood poisoning, and...

Ptolemaïs, town, Greece

(Encyclopedia)Ptolemaïs ptôlĭmīsˈ [key], town (1991 pop. 25,195), N Greece, in Macedonia. It was a small market town until 1958, when it began to be developed as an industrial center. Lignite, mined there in v...