observer

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ob·ser·ver

(ob-zĕr'vĕr),
One who perceives, notices, or watches; in behavioral research with humans, the investigator or his/her surrogate.
[L. observo, to watch]

observer

An international medical graduate—a doctor who was educated and trained outside of the US—who joins a medical or surgical team at a teaching hospital in the US to observe the style and particulars of patient management. Observers are usually sponsored by a foreign hospital or university and have a mentor assigned to them; they are expected to have a good command of English, must have a valid visa, and do not participate in direct patient management.
References in classic literature ?
He had stood by the door, all this while, observant of her with a smile upon his face, though his black eyebrows were heavily contracted.
It came of my lifting up my own eyes from a task I was poring at - writing some passages from a book, to improve myself in two ways at once by a sort of stratagem - and seeing Biddy observant of what I was about.
Jansenius, uneasily observant of the curiosity and surprise this dialogue was causing.
Iwanich was not the least discouraged by the failure of his elder brothers, though they were both much older and stronger than he was, and when night came climbed up the tree as they had done, The moon had risen, and with her soft light lit up the whole neighbourhood, so that the observant Prince could distinguish the smallest object distinctly.
Though such a piece of news was like a gold mine to work in the monotonous lives of these personages, the observant and distrustful chevalier thought he recognized in the worthy woman a far more extended sentiment; namely, the joy caused by the triumph of self-interest.
I was too cold and too sleepy to be keenly observant, and not sleepy enough to betray my trust, so altogether I had a dreary, miserable time.
de Treville requested Athos, whatever might happen, to be observant of his duty to the king, but particularly to the queen, begging him to convey his desires to his comrades.
The observant regiment, standing at rest in the roadway, whooped at once, and entered whole-souled upon the side of the maiden.
Seldom in Adam's life had his face been so free from any cloud of anxiety as it was this morning; and this freedom from care, as is usual with constructive practical minds like his, made him all the more observant of the objects round him and all the more ready to gather suggestions from them towards his own favourite plans and ingenious contrivances.
I proceeded to handle the papers; Frances, observant and serviceable, stepped into an inner room, brought a candle, lit it, placed it by me; then drew the curtain over the lattice, and having added a little fresh fuel to the already bright fire, she drew a second chair to the table and sat down at my right hand, a little removed.
Some rose at times; but by far the larger part continued unbending; observant, it is true, but it was the kind of observation that regarded the ceremony as a spectacle rather than a worship in which they were to participate.
The king only recovered his attention in some degree at the moment that Monsieur Colbert, who had been narrowly observant for some minutes, approached, and, doubtless, with great respect, yet with much perseverance, whispered a counsel of some sort into the still tingling ears of the king.