>>Still on Latin, you're a scholar, I'd always understood that latin adjectives agreed with their nouns, such as "Bigus Dicus". And Magnus is very typical, being of the 3 main declensions: "us", "a" and "um".
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>>Why is it then that they refer to artists' "Magnum Opus"? Shouldn't that be "Opus Magnus"?
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>There are five declensions in Latin that I learned, and opus goes by fourth, which is neutral nouns ending on -l, -en, -t, -ar, -ur, -us (not all nouns with these endings, though - just the neutral ones).

The 3 main declensions I learnt were like "lupus", "Puella" and "pratum".
You'd get "Puella magna", "lupus magnus" or "pratum magnum". So, you haven't answered my question: shouldn't "Magnum Opus" (great work?) be "Opus Magnus", also given that the adj. should follow the noun?