-logist

comb. form forming nouns denoting a person skilled or involved in a branch of study etc. with a name in -logy (archaeologist; etymologist).

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-logist

an ending resulting from the addition of -ist to ns. in -logy, forming ns. with the general sense ‘one who is versed in ―logy’. It is now the only living formative with this function, the older equivalents -loger, -logian, -logue occurring only in very few words (most of which are obsolescent). The formation is mainly English, though a few examples, as étymologiste, chronologiste, have existed in Fr. from the 16th or 17th c., and others, as zoologiste, appear first in the 19th c.