English litmus

← Old English wlite (cognate)

← English moss (link)

← Middle English litmose (inherited)

← Middle English lytmose (mention)

← Middle English litemose (mention)

← Proto-Germanic *wlitiz (derived)

← Proto-Germanic *wlituz (mention)

← Proto-Indo-European *wel- (derived)

← Old Norse litmosi (derived)

← Old Norse lita (mention)

← Old Norse litr (mention)

← Old Norse mosi (mention)

→ English lit (link)

→ English litmus test (compound)

→ English azolitmin (affix)

→ German Lackmus (cognate)