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On the top of; upon; on. See On to, under On, prep.

The history of the individual development of an organism; the history of the evolution of the germ; the development of an individual organism, -- in distinction from phylogeny, or evolution of the tribe. Called also henogenesis, henogeny.

Of or pertaining to ontogenesis; as, ontogenetic phenomena. -- On`to*ge*net"ic*al*ly, adv.

Ontogenetic.

Ontological.

Of or pertaining to ontology.

In an ontological manner.

One who is versed in or treats of ontology. Edin. Rev.

That department of the science of metaphysics which investigates and explains the nature and essential properties and relations of all beings, as such, or the principles and causes of being.

An instrument for making such tracings, as a recording brontometer.

An aërolite. [R.]

A treatise upon thunder.

An instrument for noting or recording phenomena attendant on thunderstorms.

A genus of American jurassic dinosaurs. A length of sixty feet is believed to have been attained by these reptiles.

A genus of large extinct mammals from the miocene strata of western North America. They were allied to the rhinoceros, but the skull bears a pair of powerful horn cores in front of the orbits, and the fore feet were four-toed. See Illustration in Appendix.

An extinct animal of large size, known from its three-toed footprints in Mesozoic sandstone.

A species of medal or medallion of bronze, having a deep furrow on the contour or edge; -- supposed to have been struck in the days of Constantine and his successors. R. S. Poole.

See Contortion.

ether; to turn awry; to bend; to distort; to wrest. The vertebral arteries are variously contorted. Ray. Kant contorted the term category from the proper meaning of attributed. Sir W. Hamilton.

Twisted, or twisted together. "A contorted chain of icicles." Massinger.