see dietician.
"one who practices some theory of diet," 1845, from diet (n.1) on model of physician. Earlier was dietist (c. 1600).
updated on November 21, 2012
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。