Does anyone know if there is a connection between 口 and 唇? I see that the latter includes the “mouth” radical, but the other radical doesn’t seem related to the lips at all. I’m wondering if there’s some historical meaning behind びる that would suggest a relationship.
We went over the vocabulary for body parts in my Japanese class recently and I asked my teacher, but she said she never even considered the relationship as a native speaker.
What a mystery 
I don’t know. But sometimes part of he kanji is more related to the pronunciation (onyomi) than the actual meaning.
I didn’t know how to say lips though. Seems easy to remember 
Hmm “sure enough” the onyomi reading of 唇 is しん, just like kanjis that have the same radical (the one that is not 口) - example 地震 (じしん) for earthquake
Excellent resource !
oh nice find! Etymology is so interesting, so I’ll definitely save this website for later! 
The real etymology is above, but for a completely fake one: The びる suffix can be used to mean “to look like, or to appear”.
…
くちびる: Act like a mouth. Ok maybe not really 
