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Related to pollster: Rasmussen
One that takes public-opinion surveys.
Word History: The suffix -ster is used to make nouns referring to persons and can be found in a variety of words that are part of the current vocabulary of English, such as hipster, huckster, jokester, pollster, and youngster. Some of these nouns can refer to either males or females, while others typically denote males. Originally in Old English, however, the suffix (then spelled -estre) was used to form feminine agent nouns. Hoppestre, for example, meant "female dancer" and was the feminine corresponding to the masculine hoppere, "dancer" (that is, a " hopper," so to speak). The suffix -estre was occasionally applied to men in Old English, but mostly to translate Latin masculine nouns denoting occupations that were usually held by women in Anglo-Saxon society. An example is bæcester, "baker," glossing Latin pistor; it survives as the Modern English name Baxter. In Middle English its use as a masculine suffix became more common in northern England, while in the south it remained limited to feminines. In time the masculine usage became dominant throughout the country, and old feminines in -ster were refashioned by adding the newer feminine suffix -ess (borrowed from French) to them, such as seamstress remade from seamster. In Modern English, the only noun ending in -ster with a feminine referent is spinster, which originally meant "a woman who spins thread."
a person who conducts opinion polls
one who conducts public-opinion polls.