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One who watches; one who sits up or continues; a diligent observer; specifically, one who attends upon the sick during the night.

Full of watch; vigilant; attentive; careful to observe closely; observant; cautious; -- with of before the thing to be regulated or guarded; as, to be watchful of one's behavior; and with against before the thing to be avoided; as, to be watchful against the growth of vicious habits. "Many a watchful night." Shak. "Hap…

A remarkable meteorological phenomenon, of the nature of a tornado or whirlwind, usually observed over the sea, but sometimes over the land.

The end of the week; specif., though loosely, the period observed commonly as a holiday, from Saturday noon or Friday night to Monday; as, to visit one for a week-end; also, a house party during a week-end.

Of, pertaining to, or observed at, Whitsuntide; as, Whitsun week; Whitsun Tuesday; Whitsun pastorals.

And the rib, which the Lord God had taken from man, made he a woman. Gen. ii. 22. I have observed among all nations that the women ornament themselves more than the men; that, wherever found, they are the same kind, civil, obliging, humane, tender beings, inclined to be gay and cheerful, timorous and modest. J. Ledyar…

The yellow discoloration often observed in cancerous tumors.

The rite or ceremonial observed by one of the Masonic systems, deriving its name from the city of York, in England; also, the system itself, which, in England, confers only the first three degrees.

on, etc., of spectral lines when the radiations emanate in a strong magnetic field, first observed in 1896 by P. Zeeman, a Dutch physicist, and regarded as an important confirmation of the electromagnetic theory of light.

remains at, or is brought to, zero, as contrasted with methods in which the deflection is observed directly; -- called also null method. -- Zero point, the point indicating zero, or the commencement of a scale or reckoning.