Genre and place in the book. A textbook specimen of the exercise of EXERCISEphysical definition — the "bare" view that strips a thing down to its material. The principal discipline is assent (the handling of the TERMimpression); the sustaining one is desire (removing the false value from objects of craving).
The bare definitions. A run of famous "strippings": meat is a "corpse" (νεκρός) of a fish, a bird, a pig; Falernian is "a little juice of a grape" (χυλάριον σταφυλίου); the purple border is sheep's wool soaked in the blood of a shellfish; coitus is "a rubbing of a gut" and a discharge of mucus with a spasm. The diminutives (χυλάριον, τριχία, μυξάριον) lower the pathos and make the definition soberly, almost squeamishly exact — yet this is not Cynic disgust but precise categorization: the thing is placed in its proper class.
The method (the impression that reaches things). "Such then are these TERMimpressions, and they reach the things themselves and penetrate them, and so we see what kind of things they are." This is the Stoic doctrine of the φαντασία put to therapeutic use: to a thing one applies a "bare" impression, stripped of its social-evaluative drapery. And this must be done "all through life" (παρ' ὅλον τὸν βίον) — not a single gesture but a constant hygiene of judgment. Cf. 03-11 (the method of definition), 8.49 ("abide by the first appearances, and add nothing thyself from within").
Conceit the deceiver (τῦφος). The climax is a warning: "conceit (τῦφος) is a formidable deceiver (παραλογιστής), and just when you are most sure you are busy with serious things (σπουδαῖα), that is when it most bewitches you." The most dangerous self-deception lies not in gross pleasures but in what we revere: fame, rank, "serious affairs" also need unmasking. τῦφος is the Stoic-Cynic word for "puffed-up show," an empty halo.
Crates and Xenocrates. The closing allusion: "consider what Crates says of Xenocrates himself." Crates was probably the Cynic, Crates of Thebes, a master of the deflating jibe; Xenocrates, head of the Academy, a model of austerity and incorruptibility. The point is that even the "most serious" and venerable is open to the Cynic's unmasking optics: τῦφος reaches the virtuously-weighty too. (The specific saying of Crates is not preserved — one cannot be more precise.)
Disciplines and parallels. The principal one is assent (the bare impression); the secondary is desire (removing the seduction from food, wine, luxury, sex). Parallels: 03-11 (the method of definition, its value and composition); 02-02 (the definition of man, the flesh as "blood and bones"); 04-41 (the body as a "corpse," after Epictetus); Med. 8.49; 7.29 ("Wipe out the imagination").