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Acute :: Acute (a.) Having nice discernment; perceiving or using minute distinctions; penetrating; clever; shrewd; -- opposed to dull or stupid; as, an acute observer; acute remarks, or reasoning..

Observer :: Observer (n.) One who fulfills or performs; as, an observer of his promises..

Shrewd :: Shrewd (superl.) Able or clever in practical affairs; sharp in business; astute; sharp-witted; sagacious; keen; as, a shrewd observer; a shrewd design; a shrewd reply..

Stereoscopic :: Stereoscope (n.) An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as to appear as one to the observer..

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

Speculist :: Speculist (n.) One who observes or considers; an observer.

Telemeter :: Telemeter (n.) An instrument used for measuring the distance of an object from an observer; as, a telescope with a micrometer for measuring the apparent diameter of an object whose real dimensions are known..

Observer :: Observer (n.) One who observes, or pays attention to, anything; especially, one engaged in, or trained to habits of, close and exact observation; as, an astronomical observer..

Observer :: Observer (n.) One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice..

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

Minute :: Minute (a.) Attentive to small things; paying attention to details; critical; particular; precise; as, a minute observer; minute observation..

Autophony :: Autophony (n.) An auscultatory process, which consists in noting the tone of the observer's own voice, while he speaks, holding his head close to the patient's chest..

Close :: Close (v. t.) Accurate; careful; precise; also, attentive; undeviating; strict; not wandering; as, a close observer..

Eclipse :: Eclipse (n.) An interception or obscuration of the light of the sun, moon, or other luminous body, by the intervention of some other body, either between it and the eye, or between the luminous body and that illuminated by it. A lunar eclipse is caused by the moon passing through the earth's shadow; a solar eclipse, by the moon coming between the sun and the observer. A satellite is eclipsed by entering the shadow of its primary. The obscuration of a planet or star by the moon or a planet, thoug

Distinguisher :: Distinguisher (n.) One who discerns accurately the difference of things; a nice or judicious observer.

Speculator :: Speculator (n.) One who speculates. Specifically: (a) An observer; a contemplator; hence, a spy; a watcher..

Studentry :: Student (n.) One who studies or examines in any manner; an attentive and systematic observer; as, a student of human nature, or of physical nature..

Misobserver :: Misobserver (n.) One who misobserves; one who fails to observe properly.

Observership :: Observership (n.) The office or work of an observer.

Heliotrope :: Heliotrope (n.) An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror..

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