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- Optical circle (Opt.), a graduated circle used for the measurement of angles in optical experiments. -- Optical square, a surveyor's instrument with reflectors for laying off right angles.

yish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477.

Fitted for trail or test; experimental; tentative; treating of attempts.

capability, of being affected by something external; sensation; sensibility. [Obs.] This experiment discovereth perception in plants. Bacon.

Trial; experiment. [Obs.]

to air, or to elastic fluids or their properties; pertaining to pneumatics; as, pneumatic experiments. "Pneumatical discoveries." Stewart.

nd space. Such relations are denominated laws, which are to be discovered by observation, experiment, and comparison. This philosophy holds all inquiry into causes, both efficient and final, to be useless and unprofitable.

By means of practice or use; by experience or experiment; as, practically wise or skillful; practically acquainted with a subject.

To apply theoretical science or knowledge, esp. by way of experiment; to exercise or pursue an employment or profession, esp. that of medicine or of law. [I am] little inclined to practice on others, and as little that others should practice on me. Sir W. Temple.

Fitted for trial beforehand; experimental. [R.] Sir H. Wotton.

lar plane faces or sides, and two equal and parallel triangular ends or bases; -- used in experiments on refraction, dispersion, etc.

To try or to ascertain by an experiment, or by a test or standard; to test; as, to prove the strength of gunpowder or of ordnance; to prove the contents of a vessel by a standard measure. Thou hast proved mine heart. Ps. xvii. 3.

The glass vessel in which the vacuum is produced, and the objects of experiment are put, in experiments with an air pump. Cf. Bell jar, and see Illust. of Air pump.

on was first discovered by Sir W. R. Hamilton by mathematical reasoning alone, unaided by experiment. -- Differential refraction (Astron.), the change of the apparent place of one object relative to a second object near it, due to refraction; also, the correction required to be made to the observed relative places of…

To recite or repeat in private for experiment and improvement, before a public representation; as, to rehearse a tragedy.

A secdond trial, experiment, or test; a second judicial trial, as of an accused person.

safe; freedom from hazard, danger, harm, or loss; safety; security; as the safeness of an experiment, of a journey, or of a possession.

o ratify; to confirm; to approve. Would have counseled, or even sanctioned, such perilous experiments. De Quincey.

hod employed in exact science and consisting of: (a) Careful and abundant observation and experiment.

Of or pertaining to spectrology; as, spectrological studies or experiments. -- Spec`tro*log"ic*al*ly, adv.