Past tense of administer; gave or provided something (like medicine, aid, or punishment) to someone.
From ad- + minister (to serve), from Latin ministrare. The regular -ed past tense ending was added. This is a standard archaic or alternative spelling variant of 'administered,' particularly in older texts.
Older English texts sometimes spelled this 'administerd' without the extra 'e,' which shows how spelling wasn't fully standardized until the 1800s—what looks like a typo to us was just normal variation back then.
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