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Any lidlike or operculiform process or part; as, the opercula of a dental follicle.

A short, light, musical drama.

Wrought with labor; requiring labor; hence, tedious; wearisome. "Operose proceeding." Burke. "A very operose calculation." De Quincey. -- Op"er*ose`ly, adv. -- Op"er*ose`ness, n.

Laboriousness. [R.] Bp. Hall.

Operose. [Obs.] Holder. -- Op"er*ous*ly, adv. [Obs.]

Concealed; private. [R.]

Open time; -- applied to different things:

Developing from below towards the apex, or from the circumference towards the center; centripetal; -- said of certain inflorescence.

An apparatus designed for collecting spores, germs, bacteria, etc., suspended in the air.

An instrument consisting in part of a differential thermometer. It is used for measuring changes of temperature produced by different conditions of the sky, as when clear or clouded.

In the act of groping. Mrs. Browning.

An instrument for viewing pictures by means of a lens, so as to present them in their natural proportions and relations.

Loss of the hair; baldness.

A practitioner who tries to prevent or cure baldness.

An arrangement of lenses and mirrors which enables a person to see an object in spite of intervening objects.

A product of gastric digestion, a mixture of hemipeptone and antipeptone.

An instrument for restoring a picture or image distorted by anamorphosis to its normal proportions. It usually consists of a cylindrical mirror.

Produced by the conversion of the stamens into petals, as double flowers, like the garden ranunculus. Brande.

An instrument which shows the direction of the wind; a wind vane; a weathercock; -- usually applied to a contrivance consisting of a vane above, connected in the building with a dial or index with pointers to show the changes of the wind.

An instrument for examining the capillary vessels of animals and plants. Morin.