jpdb beta

cavern; cave; cave system; grotto

cave; hollow; cavity; hollow

cave; cavern; den; grotto

hollow; cavity; hole; cave

insight; discernment; perception; perspicacity; acumen

discernment; insight

sinus; cavity; antrum; neighborhood (administrative division in North Korea)

limestone cave; limestone cavern

paper-covered lamp or lantern

hollow; cavity; hole

making hollow; making meaningless; deindustrialization; deindustrialisation

Soto school (of Zen Buddhism)

cave entrance; tunnel

lava tube

wind tunnel

tree hollow; hollow in a tree

insight; discernment

service tunnel (cables, gas, etc.)

snow cave

cavity; hollow; void

limestone cave; limestone cavern

Soto Zen

G8 Hokkaido Toyako Summit; Hokkaido Toyako G8 summit

cave bear (extinct, Ursus spelaeus)

cavity; hollow; void

venous sinus; sinus venosus

sinoatrial node

dongxiao (Chinese bamboo flute similar to a shakuhachi)

sinus rhythm

limestone cave

sinusoid

sand martin (Riparia riparia)

hollowing-out phenomenon

sea cave; marine cave

hollow horn; cavicorn

druse; globular calcium oxalate crystals, often lining a rock cavity

(animal) whiskers; vibrissae

lava cave

sinus node; sinoatrial node

palace of a retired emperor

void

cave diving

to wait for a good opportunity; to come down on the right side of the fence; to see which way the cat jumps; (lit.) to wait and see at Horagatoge

to wait for a good opportunity; to come down on the right side of the fence; to see which way the cat jumps; (lit.) to wait and see at Horagatoge

to wait for a good opportunity; to come down on the right side of the fence; to see which way the cat jumps; (lit.) to wait and see at Horagatoge

to wait for a good opportunity; to come down on the right side of the fence; to see which way the cat jumps; (lit.) to wait and see at Horagatoge

sinus arrhythmia; irregular heartbeat

geode

olm (Proteus anguinus)

Glossogobius olivaceus (species of goby)

brown-throated martin (Riparia paludicola); brown-throated sand martin