Same as Tetragonal.

neurons: one of two main classes of neurons found in the cerebral cortex; so-called because of the shape of their dendritic branchings. They are excitatory neurons, that is they promote neuron firing (rather than inhibit it)

(as in pyramidal functions): The nerve pathways of the brain and spinal cord responsible for the control of power.

shaped like a pyramid.

One of the carpal bones. See Cuneiform, n., 2 (b).

conical with flat angular sides.

Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage.

resembling a pyramid