Critical

It is submitted to the judgment of more critical ears to direct and determine what is graceful and what is not.
Holder.

Virgil was so critical in the rites of religion, that he would never have brought in such prayers as these, if they had not been agreeable to the Roman customs.
Bp. Stillingfleet.

O gentle lady, do not put me to 't,
For I am nothing, if not critical.
Shak.

Our circumstances are indeed critical.
Burke.

The small moment, the exact point, the critical minute, on which every good work so much depends.
South.

Critical angle (Optics), that angle of incidence of a luminous ray at which it is wholly reflected, and no portion of it transmitted. The sine of this angle is the reciprocal of the refractive index of the medium. -- Critical philosophy, the metaphysical system of Kant; -- so called from his most important work, the "Critique of Pure Reason." -- Critical point (Physics), a certain temperature, different for different gases, but always the same for each gas, regarded as the limit above which no amount of pressure can produce condensation to a liquid.