Lacto, ovo - how about meato-vegetarian lol.Not sure when the terms ova-vegetarians and lacto-vegetarians got coined. But I would not call that bastardization, more like being specific.
What I've read before was back in the 17 hundreds it was about abstaining from animal products because of the cruelty involved not because of health reasons and thus the term was coined in England by the intellectuals of the day. I haven't read much about the days of Aristotle or that era but what understood was that was when the term vegetarian was used.
Strict vegetarian is an interesting term in itself. Going back to @silva 's point - Soon it will be strict vegan as I'm sure I've heard the term veggan being bandied about for vegans who eat eggs.