Where does “ruśnica” come from?

ruśnica (Polish) comes from Old Polish [[rucznica]], [[rusznica]], from Czech ručnice, from Czech ruční, from Czech ruka, from Old Czech ruka, from Proto-Slavic rǫka, from Proto-Balto-Slavic ránkāˀ, from Proto-Indo-European wrenk- — to turn, to bend.

Ancestry of “ruśnica”, step by step

Step	Language	Word	Meaning
1	Old Polish	[[rucznica]], [[rusznica]]	—
2	Czech	ručnice	rifle
3	Czech	ruční	manual
4	Czech	ruka	hand
5	Old Czech	ruka	hand
6	Proto-Slavic	rǫka	hand; arm
7	Proto-Balto-Slavic	ránkāˀ	hand, arm
8	Proto-Indo-European	wrenk-	to turn, twist, bend
9	Latvian	wer-	to turn, to bend

Every word from Latvian wer- →