The Collaborative International Dictionary of English v.0.48:
Physiologist \Phys`i*ol"o*gist\ (f[i^]z`[i^]*[o^]l"[-o]*j[i^]st), n. [Cf. F. physiologiste.] One who is versed in the science of physiology; a student of the properties and functions of animal and vegetable organs and tissues. [1913 Webster]WordNet (r) 3.0 (2006):
physiologist n 1: a biologist specializing in physiology