FERRICYANIDE n.
One of a complex series of double cyanides of ferric iron and some other base. Potassium ferricyanide (Chem.), red prussiate of potash; a dark, red, crystalline salt, K6(CN)12Fe2, consisting of the double cyanide of potassium and ferric iron. From it is derived the ferrous ferricyanate, Turnbull's blue.…
FERROCYANIDE n.
One of a series of complex double cyanides of ferrous iron and some other base. Potassium ferrocyanide (Chem.), yellow prussiate of potash; a tough, yellow, crystalline salt, K4(CN)6Fe, the starting point in the manufacture of almost all cyanogen compounds, and the basis of the ferric ferrocyanate, prussian blue. It is…
FIT n.
A sudden and violent attack of a disorder; a stroke of disease, as of epilepsy or apoplexy, which produces convulsions or unconsciousness; a convulsion; a paroxysm; hence, a period of exacerbation of a disease; in general, an attack of disease; as, a fit of sickness. And when the fit was on him, I did mark How he did s…
FLEA n.
An insect belonging to the genus Pulex, of the order Aphaniptera. Fleas are destitute of wings, but have the power of leaping energetically. The bite is poisonous to most persons. The human flea (Pulex irritans), abundant in Europe, is rare in America, where the dog flea (P. canis) takes its place. See Aphaniptera, and…
FLINT n.
) Same as Stone age, under Stone. -- Flint brick, a fire made principially of powdered silex. -- Flint glass. See in the Vocabulary. -- Flint implements (Archæol.), tools, etc., employed by men before the use of metals, such as axes, arrows, spears, knives, wedges, etc., which were commonly made of flint, but also o…
FRACTION n.
s the numerator, indicating the number of these parts included in the fraction; as -- Complex fraction, a fraction having a fraction or mixed number in the numerator or denominator, or in both. Davies & Peck. -- Compound fraction, a fraction of a fraction; two or more fractions connected by of. -- Continued fraction,…