"Ctene" Natural Recordings by Native Speakers
Ctene refers to a small tooth or a small peg-like structure found on the rim of a leaf, in botany. The plural form of ctene is ctenes.
I apologize, but I couldn't find any word called "crystosphene". It's possible that it's a made-up or non-existent word. If you meant to type a different word, please try again!