Similar words: therefor, reform, refer, refuse, care for, rarefy, prefix, reflux. Meaning: n. (sports) the chief official (as in boxing or American football) who is expected to ensure fair play.
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61 After this voltage was compared with REF, we can get the magnified error voltage.
62 Gazetteer Indo-West Pacific: western and southern coasts of India and off Sri Lanka to Indonesia, the Philippines and Ryukyu Islands, and south to the northern part of Australia (Ref. 3131).