The headword is aorist active participle (masculine nominative singular) of the verb a)dhlo/w. It is probably (though not demonstrably) extracted from the quotation which follows.
[1] Quotation not identified by Adler, beyond the suggestion that it be attributed to Aelian. In fact Favuzzi [see under alpha 1518] 53-54, citing earlier work by Bruhn and others, plausibly regards it as the first half of a passage of Aelian (about Kodros) that continues at chi 208 (q.v.).