Excerpts and Definitions

Thegotics  Thegosis  Drepanon  Drepanid  Incusion

The science that deals with the morphological, functional, and behavioural aspects of thegosis and the treatment of its related physical, emotional and social pathologies.
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GREEK thego, to whet, sharpen; also metaphorically, to excite, provoke.

A phylogenetically derived behaviour that sharpens (whets, hones) a tooth by grinding it violently against another; the action occurs concomitantly with a sharpening (in the metaphorical sense) of the appropriate emotion, that is, a sharpening of the physiological determinants that not only prepare (thegose) the tooth but prepare the animal to grasp, attack, defend, incise or masticate.
The morphological adjustment of the tooth and the concomitant physiological excitation of the emotion are an integral reaction to a situation of stress. The behaviour, moreover, occurs discretely from that of ingesting or of grasping. The inherent advantage is the effective preparation for survival by:
1. Fighting: the tooth is a sharp weapon for attack or defence.
2. Ingesting: the tooth is a sharp tool for incision or mastication.
3. Fighting/ingesting: the tooth is a sharp weapon/tool for grasping.
Adjective thegotic.

* The term thegosis (Every, R.G. Symposium of vertebrate palaeontology and comparative anatomy, London, 1967; Postilla, 1970, 143: 1-30) replaces attrition originally suggested (Every, R. G. Lancet, 1960, 2: 37-39).
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Greek drepane, sickle.

That part of the crown of a tooth in the upper jaw developed in the form of, and functioning as, a sickle.
Adjective drepanoid; plural drepana
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The corresponding feature to the drepanon in a tooth in the lower jaw.
Adjective drepanoid; plural drepanids.
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Latin incuso, to hammer; incus, anvil

The action of dividing an exogenous material by striking it when held or confined by a tooth-surface orientated perpendicularly to the action – such as that of an anvil or chopping-block.
Adjective incusive.
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