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To study by candlelight or a lamp; to study by night.

The act of lucubrating, or studying by candlelight; nocturnal study; meditation. After long lucubration I have hit upon such an expedient. Goldsmith.

One who studies by night; also, one who produces lucubrations.

Composed by candlelight, or by night; of or pertaining to night studies; laborious or painstaking. Pope.

In an internal-combustion engine with two or more cylinders, an induction coil and vibrator placed in the circuit between the battery or magneto and the coils for the different cylinders, which are used without vibrators of their own.

e state of being darkened; darkness. [Obs.] In every megrim or vertigo, there is an obtenebration joined with a semblance of turning round. Bacon.

To shade; to darken; to cloud. [R.] Howell.

Act of darkening or obscuring. [R.] Sir T. More.

Having eyelids.

The act of boring through. [Obs.] Ainsworth.

To celebrate again, or anew. -- Re*cel`e*bra"tion, n.

To vibrate back or in return. -- Re`vi*bra"tion, n.

To perforate; to bore; to pierce. [R.] Sir T. Browne.

Boring; perforating; -- applied to molluskas which form holes in rocks, wood, etc.

The act of terebrating, or boring. [R.] Bacon.

A genus of brachiopods which includes many living and some fossil species. The larger valve has a perforated beak, through which projects a short peduncle for attachment. Called also lamp shell.

Any species of Terebratula or allied genera. Used also adjectively.

Having the general form of a terebratula shell.

To shade; to shadow; to foreshadow. [Obs.]

Of or pertaining to the shade or darkness; shadowy; unreal; secluded; retired. [R.] B. Jonson.