A chamber in the mammalian kidney through which urine passes.
The outermost whorl of flower parts, comprising the sepals, which covers and protects the petals as they develop.
The crown containing the viscera of crinoids and similar echinoderms, entoprocts, and the polyps of some cnidarians.
A flattened cap of neuropil in the brain of insects.
A funnel-shaped expansion of the vas deferens or oviduct of insects.
Any large, roughly circular depression or hole.
The basin-like opening or mouth of a volcano, through which the chief eruption comes; similarly, the mouth of a geyser, about which a cone of silica is often built up.
A hemispherical pit created by the impact of a meteorite or other object.
The pit left by the explosion of a mine or bomb.
To form craters in a surface.
To collapse catastrophically; to become devastated or completely destroyed.
To crash or fall.