Settle an argument. I wrote a post to a group in which I participate in which I reported that the maple trees outside my window are deciduating at a great rate. Several of the wags in the group challenged the existence of the verb deciduate. I assumed a straight face and responded that it descended from the Latin "deciduare" meaning to lose one's leaves. This, of course, I made up out of whole cloth. But isn't there such a word and, if not, shouldn't there be?