Zamboni: Zombi transport vehicle.
Zeal: The very first step in your quest for apathy.
Zebras: Worn under Zeblouse.
Zeitgeist: The things we all know but nobody can understand.
Zigzag: the course of politicians as they arrive at accord, as opposed to the direct course which they take to the buffet.
Zygote: Living tissue, ambidextrously defined as parasite or child, according to the “host”‘. See Fetus
Zyzzyva: Rare insect. And . . . Every dictionary needs a last word