from ἀήρ, air, and γραφω, I describe; a description of the air or atmosphere, its limits, dimensions, properties, &c.

ÆROLITE, a term recently, but perhaps improperly, applied to those singular substances commonly called Meteoric Stones.

ÆROMANCY, a species of divination performed by means of air, wind, &c.

ÆROMETRY, the science of measuring the air. It comprehends not only the doctrine of the air itself, considered as a fluid body, but also its pressure, elasticity, rarefaction, and condensation. But the term is at present not much in use, this branch of natural philosophy being more frequently called Pneumatics.