A graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically forms the shape of a pyramid when the population is growing.

A form of pocket billiards played on a modified snooker table with narrower pockets.

Synonym of Russian pyramid

Synonym of multi-level marketing

plural of population pyramid

Elimia potosiensis, a species of elimia snail.

(geometry) A nonright pyramid, where the apex is not centered over the base.

plural of oblique pyramid

plural of pyramidal cell

(anatomy) A type of multipolar neuron found in areas of the brain including the cerebral cortex, the hippocampus, and the amygdala.