Onomatopoeia: A word or grouping of words that imitates the sound it is describing
“Oh God, what an onomatopoeic family, I thought. For Christ’s sake don’t put a bang-shang-a-lang on them Pops–they might make poopy-kaka in their pants.”
(On the rare occasion that I get to use this word I have to use my favorite quote from Christine, by Stephen King. It’s too brilliant not to use. This has come up twice today, I can’t believe it. 
)
bricolage: something made up from whatever is on hand
My stir-fry dinner could be described as a bricolage with a vaguely Asian feel.
Obvioulsy everyone here is a word-fanatic, does everyone subscribe to Wordsmith’s Word a Day service?
footle: to behave foolishly, to waste time
“The Straight Dope Message Board is the Shangri-La of footling.”
A small nitpick or correction: while fenestration may mean the placement of windows in a facade* in English*, I’d say that the meaning of the word derives not from this meaning but from the latin roots, i.e. “de-”(of or from) “-fenestra-” (window) and “-ation” (the act of). I’m not drawing this from a reference work, so I might have it a little off, but I think the point stands that the derivation does not have to do with the placement of windows. I may be wrong, but I’d also bet that the word is a later (medieval, renaissance or enlightenment) coining.
from world wide words , a rich source of obscure words
Callipygian-Having well-shaped buttocks.
This is a word about which it would be possible to generate many bad puns, thereby making an ass of oneself and becoming the butt of jokes. The subject matter — and the rather beautiful form of the word itself — has lent itself to adoption by word-hungry authors, even though the first recorded use was only in 1880. Thomas Pynchon wrote in Gravity’s Rainbow: “Those dusky Afro-Scandinavian buttocks, which combine the callipygian rondure observed among the races of the Dark Continent with the taut and noble musculature of sturdy Olaf, our blond Northern cousin”. Its origin is in Greek kallipugos, used to describe a famous statue of Aphrodite; that comes from kallos, beauty (as in calligraphy, or callisthenics, or the lily called hemerocallis) plus puge, buttocks.
moribund: dying, near death, verging on extinction
Unfortunately, it seems that the study and proper use of grammar is moribund.
obfuscate: to confuse, bewilder or stupefy
Why use clear, simple language when you can obfuscate your readers with esoteric verbiage?
From the same source: “Tetter” - a vesicular skin disease.
“He was subject to an incurable tetter”
And while we’re at it: “Vesicular” - composed of membranous and usually fluid-filled pouches
Usage see above 
schussboomer /'shoos-,boo-muhr/
: a skier who skis directly down a hill at high speeds
At most ski resorts, schussboomers are discouraged and are sometimes kicked off the runs if caught.
zzxjoanw
drum, fife, or conclusion
“I came to the zzxjoanw that the cacaphony of zzxjoanws is anathema to me.”
Actually, this turns out to be a fictitious entry, the dictionary equivalent of traps streets on maps.
When I was an obnoxious teenager, I wrote this rather sequipedalian bit of prose .
Chiasmus - a figure in prose or poetry whereby the verb/noun order is reversed between two adjacent phrases for emphatic or ornamental effect. "In this famous chorus from Haydn’s Creation we see an instance of the chiasmus:
The heavens are telling the glory of God; the wonder of his works displays the firmament.
Note the third-person singular verb in the second phrase: it is the firmament that is displaying the wonder of his works, and not the other way around. So the first phrase is the familiar ‘subject-verb-object’ and the second echoes it with ‘object-verb-subject’ "
Blatherskite: a verbose person, who talks nonsense
My professor is such a blatherskite, he makes no sense at all!
hurple–The act of lowering your neck and raising your sholders in response to cold weather.
And when I hurple
My neck turns purple.
Proxyglossariasis- A condition whereby instead of saying the word you mean, you say the next word in the dictionary.*
Professor Smith has a terrible case of Proxyglossariasis- have you read his thesis on the Knights Temporary during the Crusades?
*Yes, I stole this from an episode of Duckman, but it’s a great word and it deserves wider recognition, IMHO.
iracund: easily angered, irascible
The list of iracund Dopers would be quite extensive.
fooster, v.i. (Irish English) To dither, potter, or mess, typically followed with around. (“The crowd could hear him rootin and searchin and foosterin around” - Flann O’Brien) See also Yiddish futz.
**quincunx **- an arrangement of five spots; four in the form of a square with the fifth spot in the centre (like the five on a regular die).
**squamous **- scaly.
“His squamous skin, peppered with a quincunx of pimples, repulsed me.”
Bathycolpian: deep-bosomed. A companion word to Callipygian, I’ve always thought.
I claim band name rights to Quincunx of Pimples.
Psst… see post #25. 
Sanbenito: n. - Spanish Inquisition garment resembling a scapular, either yellow with red St. Andrew’s crosses for penitent heretics or black and decorated with friars and devils for impenitent heretics at an auto-da-fé.
Whoever approved that New Yorker magazine cover of Obama as a Muslim and Michelle as a 70s radical should be made to don a black sanbenito, then set afire.