水母の骨 くらげのほね something that one would not expect to exist; something exceedingly rare; jellyfish bones exp obsc id Advanced ➥
下腿骨 かたいこつ lower leg bone (esp. the tibia and the fibula, but sometimes also including the patella) n Advanced ➥
掌骨 しょうこつ bones of the palm (esp. the metacarpals, but sometimes also including the carpals) n adj-no obsc Advanced ➥