OE (700-1100) verb amasod (past participle = amazed): in the beginning it meant to stun (now obsolete). Later it meant to bewilder and at some time in the 16th century took on the meaning to overwhelm with wonder. By the ME period amasod had changed it's form to amased. On the other hand, there was a word 'maze', with the meaning to stupefy or daze, which is dialectal but has been found in the English language since the 8th Century. At first it was only used in past-participles but it could have various prefixes, as in bimased and amased. By the 15th century its meaning had changed to 'bewilder'. Just when the derivative noun, 'mazer', came into being doesn't appear to be documented..(Oxford Dictionary of English Etymology) However, I wonder if it is 'our' word, Maggie. I worked at the Royal Infirmary in Doncaster a number of years and this word 'mazer' was in common use in the area, especially among older folks. Have you heard it in your area and if so has it the same meaning?