Pyraform organ see esophageal bulb

pyramid n. [Gr. pyramis, pyramid] 1. Any conical or triangular structure. 2. (ECHINOD: Echinoidea) The five large calcareous scraping plates that compose the Aristotle's lantern. pyramidal a.

pyramid of biomass Weight relationships between the trophic levels in a food chain.

pyramid of energy Energy relationships between the trophic levels in a food chain.

pyramid of numbers Numbers of individuals at the different trophic levels in a food chain.

pyriform a. [L. pyrum, a pear; forma, shape] Having the shape of a pear; round and large at one end, generally tapering to the other.

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