The Collaborative International Dictionary of English v.0.48:

Lecturer \Lec"tur*er\ (-[~e]r), n.
   One who lectures; an assistant preacher.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lecturer
    n 1: a public lecturer at certain universities [syn: lector,
         lecturer, reader]
    2: someone who lectures professionally

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "lecturer":
   Bible clerk, Bible reader, Boanerges, acolyte, almoner, anagnost,
   assistant, assistant professor, associate, associate professor,
   beadle, bedral, capitular, capitulary, chalk talker,
   choir chaplain, churchwarden, clerk, deacon, deaconess, discourser,
   elder, elderman, emeritus, expositor, expounder, homilist,
   instructor, lay elder, lay reader, lector, parish clerk,
   praelector, preacher, precentor, professor, professor emeritus,
   pulpitarian, pulpiteer, reader, retired professor, ruling elder,
   sacrist, sacristan, sermoner, sermonist, sermonizer, sexton,
   shames, sidesman, succentor, suisse, teaching elder, thurifer,
   tutor, verger, vergeress, visiting professor



The Devil's Dictionary (1881-1906):

LECTURER, n.  One with his hand in your pocket, his tongue in your ear
and his faith in your patience.