Meridies as near as I can figure is a compound word from merus a um and day meaning pure day or noon. Why are other words with meri not showing up as actual words when I look them up in my dictionary?
1 - Meridies means midday. The reason why you have not found in the dictionary is because such coumpound may not exist, or may be, if there be, of unusual usage.
2 - Not all compositions of different words are possible. For instance agricola is a compound of ager and the verb colo (colare). But there is no agrisema, agrisemis, or whatever. Such compounded words comes already formed by the romans.
Note: you can not compose words arbitrally, conjoining one word with another like you would with german or english.
how far am I allowed to go with tacking acjectives and prefixes onto words to come up with new meanings like Conirus strongly angry and others? Please explain.
1 - You can, on the other hand attach suffixes and prefixes, they are usually the prepositions themselves like ob praeter de in cum, which undergoes phonetic transformations. (these are all praefixes)
2 - Some others are particles, with the specific existence to serve as prefixe, like dis; and the sufixes like tor, sor, lus and many others.
3 - Do not mistake this derivation, for compostion, this is conjoin words, like the agricola, it cannot be done; that other is derivation, conjoin suf and praefix, that can and ought to be done to form new words. Like to say property to be/have this or that, like amicus > amicitia; stultus > stultitia; dignus > dignitas etc
4 - In most cases the meanings alterations are fixed, are correlated to their origin, like inire, inesse, but the exceptions are sure to be shown in your book, as it is sure tio be shown the proper uses of some suffixes that can only be attached to verbs, others to adljectives etc.
5 - “Srongly angry” could be rendered as irosus
