I’m a philosophy student by day and have recently (tonight) decided that the “therefore symbol” in logic, ∴, is long overdue for a proper name. It’s a symbol consisting of three dots, so naturally I want to call it “three-dotted thing” in Latin. I need an adjective which means “three-dotted”, but my dictionary doesn’t contain an entry for even a one-dotted thing. As I was looking around, I came upon “punctum, -i, n., prick, puncture; dot; spot”, obviously from the PPP of “pungo, pungere…”. Now, my first instinct was to take that “punctus” and prepend a “tri-”, leaving me with the adjective "tripunctus, -a, -um, adj., having been punctured thrice (i.e., three-dotted). I almost banged it into the neuter and called it a night, but instead I decided to hop on over to the “tri-” section of my dictionary in order to have a quick peek at some other “tri-” adjectives. “tri-, pref, consisting of three of the things named, e.g., tricornis having three horns”. Hmm, “cornu, -us” is a fourth decl. n., but when it is turned into an “tri-” adjective (three-horned), it becomes a third declension. I didn’t feel comfortable making any sweeping assumptions based on how a particular fourth decl. noun is converted to an adjective, so I checked on a couple of first and second decl. nouns as well. “angulus, -i, m., angle” holds decl. becoming “triangulus, -a, -um, adj., three-angled, triangular”, but a lot of other 2nd declensions such as “remus, -i, m., oar” become 3rd declensions “triremis, -is, -e, adj., having three banks of oars”. Just about all of the 1st declension feminine nouns listed in my dictionary which have “tri-” adjective equivalents become 3rds as well. Is it safe for me to assume that because i’m starting with a PPP, that “three-dotted” is simply going to be “tripunctus”, or would it be formed from the subst. n. “punctum”, and possibly become “tripunctis”. I know this seems like a stupid thing to be thinking about so excessively, but honestly, I’m really not concerned with the name of the symbol anymore. I guess I’m just curious to know whether there’s a consistent set of rules by which to form adjectives from nouns. I did a very light Google search on the subject and couldn’t come up with anything. I’d really appreciate it if anybody who is more knowledgeable, has done a lot of composition, or simply has an opinion on the matter could throw in her or his two cents. As of right now, I’ve only got two.
Thanks,
William