This is the word my 7 year-old used on me yesterday.
I had to look it up....
1.of or resembling cartilage.
2.having a skeleton composed either entirely or mainly of cartilage, as vertebrates of the class Chondrichthyes, which includes the sharks, rays, and skates.
Ah ok, when did he get smarter than me? Oh I see, at seven, I get it.
But then when we got out a shark book, he laughed for 15 straight minutes about two words "anal fin."