<word meaning & root formation>

Wadi: valley; stream; watercourse drying up in summer; oasis [from Arab. wādī‎, (“river” or “watercourse,”)]

Wanion: unluckily, due to the waning of the moon [from MidEng. waniand, from wanien, wanen (“to wane”)]

Withershins: in an unfortunate direction [from MidHighGer. wider (“against”)+ –sin (“direction”)]
Witling: a petty smart Alec; a mere pretender to wit (Bowler)[conjunction of wit + -ling]

Xenium: a present given to a guest [from Gk. xenial (pertaining to hospitality or relationship between host and guest) (cf. Xenodochium: a building for the reception of strangers; a caravanserai)

Caravanserai in Fars, Iran

Xenogenous: due to an outside cause; of foreign origin [from Gk. xeno]

word meaning & root formation

Yaul: to deviate from a stable course because of oscillation about the longitudinal axis (Rocket science) (Origin unknown)

Yegg: a burglar of safes; safecracker (Origin obscure: one (dubious) suggestion is from German jäger (“hunter”))

The challenge of the Yegg (Chubb advertisement)

Yemeles: negligent; careless; heedless [OldEng. from Germ.]

Yisse: desire or covet (Origin unknown)

word meaning & root formation

Zeigarnik: (Psych.) the theory that people remember unfinished or interrupted tasks better than completed tasks; the tendency to remember an uncomplicated task [named after Lithuanian-Soviet psychologist Bluma Zeigarnik (Zeigarnik Effect]

Zelotypia: morbid zeal; excessive jealousy [L. zēlotypia (“jealousy”) (Pliny) from Gk. (“jealousy, rivalry, envy“) 

Zoilism: carping; destructive criticism [from Zoilus, ancient Greek grammarian and literary critic … was hyper-critical of Homer (Zoilus the “Homeromastix”)]

Zoilus of Ephesus

Zooerastia: (–asty) the practice of a human engaging in sexual intercourse with an animal; bestiality [from Gk. zoo + -astia]

Zoopery: experimentation on animals [from zoo + L. –operārī (“to work, labor, toil, have effect”)]

Zugzwang: a state of play in chess where the player is at a disadvantage as his or her next move will worsen their position in the game (cf. snookering) [from Ger. (“compulsion to move”)]

Zugzwang