ἀρκτικός

ή, όν

ἄρχομαι

A. initial, placed at the beginning, of a sentence, A.D. Synt. 28.19; ἀ. τεθεὶς σύνδεσμος Demetr. Eloc. 56; of a word, συλλαβή Heph. 1.
2. originative, c. gen., πυρετοῦ Gal. 17(2).299.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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