From Wiktionary, the free dictionary
ме́лкий (mélkij) + -о (-o)
ме́лко • (mélko)
- shallowly (in a shallow manner, not deep)
- finely, in small particles, (written) in very small letters (of texts)
ме́лко • (mélko)
- short neuter singular of ме́лкий (mélkij)