This paper develops guidelines for instructional materials for advanced English as a second language students in which the objects of instruction would be: (1) the relationship between surface structures of lexical items and their underlying meanings; (2) the important aspects of structural forms; and (3) the special uses of words in the lexicon of English for Preventive Medicine (EPM) which have been borrowed from ordinary English or from Greek or Latin. The analytic approach used in the study extracts significant language forms from textual passages for special study. The study is based on the concept that vocabulary and syntax are closely interrelated and that, therefore, both are essential in the production of meaning. The model worked out in the study accounts for the sources of lexical items, their potential syntactical and morphological modifications, and their dependence or lack of dependence on context. Distinctive features of the lexicon are identified and analyzed and tentative generalizations are drawn. Instructional guidelines and sample vocabulary exercises are proposed. The excercises were constructed in anticipation of problems that foreign graduate language learners are likely to encounter. (Author/AMH)