The current study aimed to investigate the effects of a proposed blended learning strategy in teaching medical vocabulary at Arabian Gulf University (AGU) on some outcomes of the learning process. The study attempted to assess the effects of the proposed strategy on pre-medical students' achievement, attitudes towards the English language, and their satisfaction with the unit. The study sample consisted of 50 students who scored less than 60% in AGU English Language Entry exam. The sample was randomly divided into two groups; 22 students in the control group and 28 in the experimental group. The research instruments included: AGU English language unit exams in English 151, attitude towards English language and satisfaction with the unit scales that were developed by the researcher. Data analysis revealed that, concerning achievement and attitude towards the English language, there were no statistical significant differences between the experimental and the control group except with regard to the second midterm exam total score where the control group performed significantly better than the experimental group. The results also indicated that the experimental group members demonstrated high degree of satisfaction toward the online unit in three dimensions of the scale and medium satisfaction in one dimension. It was argued that though students were satisfied with the online unit, lack of vocabulary improvement was due to lack of administrative support. Thirteen appendices are included: (1) Reviewers; (2) The First Version of the Attitude Scale; (3) The Second Version of the Attitude Scale; (4) The Attitude Scale Pilot Study; (5) The Attitude Scale; (6) The First Version of the Satisfaction Scale; (7) The Second Version of the Satisfaction Scale; (8) The Students Satisfaction with the Unit Scale; (9) The Online Unit Judgment Criteria; (10) The Online Unit Practicing Criteria; (11) The Online Unit Guide; (12) The Icons Guide; and (13) The Criteria for Judging the Online Unit Guide. (Contains 18 tables and 18 figures.)