V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry अर्थिक
अर्थिकarthikaA crier, watchman.
[अर्थयते इत्यर्थी कन्]
A crier, watchman.
Especially, a minstrel whose duty it is to announce (by song etc.) the different fixed periods of the day, such as the hours of rising, sleeping, eating etc.