Vegetus (veh'.geh.tuss) is the Latin word meaning lively or vigorous. The word vegetarian was purposefully derived from vegetus, not vegetable, by the folks at the Vegetarian Society of the UK, or at least that's what one of them said (see The Heretic's Feast). The point was that vegetarianism encompasses a lot more than not eating animals (or dairy or eggs, as per the original definition). Vegetus is also a lot more empowering than vegetable (even though that too was derived from vegetus). So the next time some smart aleck tells you fungi aren't vegetables, now you can tell him where to shove it. In your mouth, jeez, what do you think I am? Bitter?