Defn: That which indicates the condition of acidity, alkalinity, or the deficiency, excess, or sufficiency of a standard reagent, by causing an appearance, disappearance, or change of color, as in titration or volumetric analysis.
Note: The common indicators are limits, tropæolin, phenol phthalein, potassic permanganate, etc. Indicator card, the figure drawn by an engine indicator, by means of which the working of the engine can be investigated and its power calculated. The Illustration shows one form of indicator card, from a steam engine, together with scales by which the pressure of the steam above or below that of the atmosphere, corresponding to any position of the engine piston in its stroke, can be measured. Called also indicator diagram. — Indicator telegraph, a telegraph in which the signals are the deflections of a magnetic needle, as in the trans-Atlantic system.
INDICATORY
In"di*ca*to*ry, a.
Defn: Serving to show or make known; showing; indicative; signifying; implying.
INDICATRIX
In`di*ca"trix, n. Etym: [NL.] (Geom. of Three Dimensions)
Defn: A certain conic section supposed to be drawn in the tangent plane to any surface, and used to determine the accidents of curvature of the surface at the point of contact. The curve is similar to the intersection of the surface with a parallel to the tangent plane and indefinitely near it. It is an ellipse when the curvature is synclastic, and an hyperbola when the curvature is anticlastic.
INDICAVIT
In`di*ca"vit, n. Etym: [L., he has indicated.] (Eng. Law)
Defn: A writ of prohibition against proceeding in the spiritual court in certain cases, when the suit belongs to the common-law courts. Wharton (Law Dict. ).
INDICE
In"dice, n. Etym: [F. indice indication, index. See Index.]
Defn: Index; indication. [Obs.] B. Jonson.