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Bitterroot, river, United States

(Encyclopedia)Bitterroot, river, c.120 mi (190 km) long, rising in SW Mont. and flowing north to join the Clark Fork River near Missoula. A Roman Catholic mission was established on the river in 1841, and missionar...

Bethlehem, town, South Africa

(Encyclopedia)Bethlehem, town, Free State prov., E central South Africa, part and seat of Dihlabeng local municipality. It is situated in a farming and livestock area and has industries producing furniture and food...

Circleville

(Encyclopedia)Circleville, city (2020 pop. 14,182), seat of Pickaway co., S central Ohio, on the Scioto River; inc. 1853. Corn, hogs, and poultry are processed in the...

Royal Leamington Spa

(Encyclopedia)Royal Leamington Spa lĕmˈĭngtən [key], town (1991 pop. 42,953), Warwickshire, central England, on the Leam River, a tributary of the Avon. The town, with its mineral springs, is primarily a health...

hysterectomy

(Encyclopedia)hysterectomy hĭstərĕkˈtəmē [key], surgical removal of the uterus. A hysterectomy may involve removal of the uterus only or additional removal of the cervix (base of the uterus), fallopian tubes ...

metabolism

(Encyclopedia)metabolism, sum of all biochemical processes involved in life. Two subcategories of metabolism are anabolism, the building up of complex organic molecules from simpler precursors, and catabolism, the ...

peptide

(Encyclopedia)peptide, organic compound composed of amino acids linked together chemically by peptide bonds. The peptide bond always involves a single covalent link between the α-carboxyl (oxygen-bearing carbon) o...

birdsong

(Encyclopedia)birdsong. Song, call notes, and certain mechanical sounds constitute the language of birds. Song is produced in the syrinx, whose firm walls are derived from the rings of the trachea, and is modified ...

beta-blocker

(Encyclopedia)beta-blocker or beta-adrenergic blocking agent bāˈtə ădˌrənûrˈjĭk [key], drug that reduces the symptoms connected with hypertension, cardiac arrhythmias, angina pectoris, migraine headaches, ...

catecholamine

(Encyclopedia)catecholamine kătˌəkôlˈəmēn [key], any of several compounds occurring naturally in the body that serve as hormones or as neurotransmitters in the sympathetic nervous system. The catecholamines ...