Empirical formula(Chem.), an expression which gives the simple proportion of the constituents; as, the empirical formula of acetic acid is C2H4O2.Graphic formula, Rational formula(Chem.), an expression of the constitution, and in a limited sense of the structure, of a compound, by the grouping of its atoms or radicals; as, a rational formula of acetic acid is CH3.OH; — called also structural formula,

Formicary
(For"mi*ca*ry) n. [LL. formicarium, fr. L. formica an ant.] (Zoöl.) The nest or dwelling of a swarm of ants; an ant-hill.

Formicate
(For"mi*cate) a. [L. formica an ant.] (Zoöl.) Resembling, or pertaining to, an ant or ants.

Formication
(For`mi*ca"tion) n. [L. formicatio, fr. formicare to creep like an ant, to feel as if ants were crawling on one's self, fr. formica ant: cf. F. formication.] (Med.) A sensation resembling that made by the creeping of ants on the skin. Dunglison.

Formicid
(For"mi*cid) a. (Zoöl.) Pertaining to the ants.n. One of the family Formicidæ, or ants.

Formidability
(For`mi*da*bil"i*ty) n. Formidableness. Walpole.

Formidable
(For"mi*da*ble) a. [L. formidabilis, fr. formidare to fear, dread: cf. F. formidable.] Exciting fear or apprehension; impressing dread; adapted to excite fear and deter from approach, encounter, or undertaking; alarming.

They seemed to fear the formodable sight.
Dryden.

I swell my preface into a volume, and make it formidable, when you see so many pages behind.
Drydn.

Syn. — Dreadful; fearful; terrible; frightful; shocking; horrible; terrific; tremendous.

Formidableness
(For"mi*da*ble*ness), n. The quality of being formidable, or adapted to excite dread. Boyle.

Formidably
(For"mi*da*bly), adv. In a formidable manner.

Formidolose
(For*mid"o*lose) a. [L. formidolosus, fr. formido fear.] Very much afraid. [Obs.] Bailey.

Forming
(Form"ing) n. The act or process of giving form or shape to anything; as, in shipbuilding, the exact shaping of partially shaped timbers.

Formless
(Form"less), a. Shapeless; without a determinate form; wanting regularity of shape.Form"less*ly, adv.Form"less*ness, n.

Formula
(For"mu*la) n.; pl. E. Formulas L. Formulæ [L., dim. of forma form, model. SeeForm, n.]

1. A prescribed or set form; an established rule; a fixed or conventional method in which anything is to be done, arranged, or said.

2. (Eccl.) A written confession of faith; a formal statement of foctrines.

3. (Math.) A rule or principle expressed in algebraic language; as, the binominal formula.

4. (Med.) A prescription or recipe for the preparation of a medicinal compound.

5. (Chem.) A symbolic expression (by means of letters, figures, etc.) of the constituents or constitution of a compound.

Chemical formulæ consist of the abbreviations of the names of the elements, with a small figure at the lower right hand, to denote the number of atoms of each element contained.


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