The beginner (like me) might occasionally find a word he is not familiar with. It is usually easy to retrieve the base-form (nom. or stem for a verb) and find it in a dictionary. Even more, there are tools today (like Wiktionary or William Whitaker's Words) that exact the base-form themselves.
Yet sometimes it simply does not work. I suspect in many cases this is because the author adopts a different spelling than the regular. Examples:
- appellarunt for appellaverunt (this kind of shift - like others - is supported in Words).
- Adding "st" (which I still not sure as to what this signifies) as in "agitandumst vigilias (Pl. Trin. 869)
- Real-life example: The word praecipe in "Occumbunt multi letum ferroque lapique aut intra muros aut extra praecipe casu" (Enn. Ann. 391 Vahl).
If you search praecipe using the tools mentioned, you get the imperative of praecipio which is clearly not the case here. It rather looks like the abl/adv of "praeceps" - I assume it is a some kind of spelling derivation(?), that might occur in other cases as well.
So the question is: Is there a kind of list of spelling contractions/suffix/prefix that are less-regular, yet common enough?
I now see that Perseus supports the first two examples