Attested in the Middle Irish period. Further etymology uncertain: EDIL states that OIr. admad is the verbal noun of *ad-moin (meaning?). Alternatively, CDB refers to a connection with MIr. maide m. 'post, stick, bundle, wood' < PCelt. *mazdyo- ‘stick’ < PIE. *masdo- (RM), cognate with Lat. mālus, OIc. mastr 'mast'; and also OIr. mátán m. 'club', "which could be from *māzd-ān-o-" (RM). All these Celtic-Italic-Germanic words were "probably borrowed from some pre-IE source" (RM).
Buck, C., D. (1949). A dictionary of selected synonyms in the principal Indo–European languages: a contribution to the history of ideas. Chicago: University of Chicago Press.
Dictionary of the Irish language: based mainly on old and middle Irish materials. (1913-1976). Dublin: Royal Irish Academy. Online at: http://edil.qub.ac.uk/dictionary/search.php
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Robert Farren, PIE culture words collection, 2017
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