Nonius Marcellus, Compendium of Doctrine, Vol. II

the mouth [comes] osculum kiss; savium kiss is said to come from suavitas sweetness. Varro in On the Life of the Roman People, book I: And therefore this is called osculum because it is from the os mouth, not from sweetness, whence comes savium, which is similar [to saviunt they kiss].

Between sacrificare to sacrifice and litare to offer propitiatory sacrifice there is this difference: sacrificare is to seek favor; litare is to propitiate and to obtain a vow. Virgil, Aeneid, book IV:

If only you would ask the gods for favor and, with the sacrifices made, litatis you obtain the propitiation;

that is: with the vows obtained. Plautus in Poenulus:

If by Hercules that was ever done, then may Jupiter
Make me always sacrifice, may I never litem obtain the propitiation!

Expleri to be filled and satiari to be satiated have this difference. Expleri is merely to be full; satiari is to be expleri beyond measure, to the point of abundance. Lucretius, book III:

Then to feed the ungrateful nature of the mind always
And to fill it with good things and never to be satiated.

M. Tullius Cicero in On the Republic, book VI: For the grave passions, the mistresses of our thoughts, compel and command certain infinite things: which, because they can be neither filled nor satiated in any way, drive those whom they have inflamed with their allurements to every crime.

Arcus bow/arch and arquus rainbow differ in this. For arcus is called any suspended arch; arquus is only that which appears in the sky, which the poets have called Iris. Whence also those are called arquati jaundiced/rainbow-colored whose color and eyes are green as if in the likeness of a rainbow. Lucretius, book VI: