The X Quiz

We have now arrived at the letter X. Fill out the answers according to the clues.

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Last updated: March 3, 2014

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First submitted	March 1, 2014
Times taken	265
Average score	39.1%
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Hint	Answer
One set of coordinates on a plane	X-axis
In Pair 23 of a gene, these determine gender	X-chromosome
This nomadic tribe menaced south Mongolia	Xiongnu
Small, three-masted Mediterranean boat	Xebec
A Greek philosopher, theologian, poet and critic	Xenophanes
Fragments of older rock embedded in igneous layers	Xenolith
A prescription drug to cure anxiety, insomnia, and panic	Xanax
Element 54, a heavy, colorless gas	Xenon
A natural alcohol found in plants used as sugar substitute in gum and others	Xylitol
A fear of strangers, or even anything foreign	Xenophobia
Central Chinese city, once its capital	Xi'an
An abnormal dryness of a body part	Xerosis
One capital of Kublai Khan's Yuan Dynasty	Xanadu
A popular copying-machine company	Xerox
A Bantu tribe living mainly east of the Cape Province	Xosa
Ancient Persian king who failed to conquer Greece	Xerxes
A process using invisible waves whereby bones can be seen	X-ray
A popular holiday phrase that replaces 'Christ' with the Greek letter	X-mas
A polysaccharide secreted by a bacterium, used as food additive ('gum')	Xanthan
One of the two processing tubes in plants	Xylem
Very popular gaming system	X-box
An insect, mollusk or crustacean that eats wood	Xylophage
Percussion instrument with a small mallet and plates	Xylophone