Foreign Intelligence Surveillance Act
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～ an act passed by Congress in 1978 to establish procedures for requesting judicial authorization for foreign intelligence surveillance and to create the Foreign Intelligence Surveillance Court; intended to increase United States counterintelligence; separate from ordinary law enforcement surveillance
Foreign Intelligence Surveillance Court
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～ a secret federal court created in 1978 by the Foreign Intelligence Surveillance Act; responsible for authorizing wiretaps and other forms of electronic surveillance and for authorizing searches of suspected spies and terrorists by the Department of Justice or United States intelligence agencies
frontal suture
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～ the suture between two halves of the frontal bone (usually obliterated by the age of 6)
fairy swallow
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～ fancy domestic pigeon having blue-and-white plumage and heavily muffed feet
fire-swallower
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～ a performer who pretends to swallow fire
free-swimming
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～ (of animals) able to swim about; not attached
fencing sword
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～ a sword used in the sport of fencing
Ficus sycomorus
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～ thick-branched wide-spreading tree of Africa and adjacent southwestern Asia often buttressed with branches rising from near the ground; produces cluster of edible but inferior figs on short leafless twigs; the biblical sycamore
Fagus sylvatica purpurea
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～ variety of European beech with shining purple or copper-colored leaves
Fagus sylvatica
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～ large European beech with minutely-toothed leaves; widely planted as an ornamental in North America
Fagus sylvatica pendula
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～ variety of European beech with pendulous limbs
Fagus sylvatica atropunicea
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～ variety of European beech with shining purple or copper-colored leaves
Ficus carica sylvestris
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～ wild variety of the common fig used to facilitate pollination of certain figs
family Sylviidae
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～ in some classifications considered a subfamily (Sylviinae) of the family Muscicapidae: Old World (true) warblers; American kinglets and gnatcatchers
fissure of Sylvius
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～ the deepest and most prominent of the cortical fissures; separates the frontal lobes and temporal lobes in both hemispheres
family Symplocaceae
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～ a dicotyledonous family of order Ebenales
Fallot's syndrome
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～ a congenital heart defect producing cyanosis; characterized by four symptoms: pulmonary stenosis and ventricular septal defect and malposition of the aorta over both ventricles and hypertrophy of the right ventricle
fetal alcohol syndrome
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～ a congenital medical condition in which body deformation occurs or facial development or mental ability is impaired because the mother drinks alcohol during pregnancy