Margaritaceous! Of margaritas? Full of margaritas? Lime-tasting? Salty? None of the above. Margaritaceous is a word, but it has nothing to do with margaritas. However, the person who picks the word of the day at Dictionary.com has a sense of humor and chose that word for today. So the real definition: resembling mother-of-pearl. Margarit, the term’s…