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Z boson
Z boson is an unchanged massive {91GeV/c2 (c is the speed of light in a vacuum; 2 is for it squared)-particle of the Weak Force.

zeal-noun
means intense emotion compelling action; implies energetic and unflagging pursuit of an aim or devotion to a cause (preaches with the zeal of the converted); eagerness and ardent interest in pursuit of something; fervor
synonym-passion
zealous
filled with or characterized by zeal-(zealous missionaries) 
zealously-adverb
zealousness-noun
zealot-noun
one who is zealous

zilch-noun
zero; nothing
zilch-adjective
amounting to nothing; nil (business was zilch)

zygote-noun
any cell formed by the union of two gametes (the marrying {Greek, 'gamos'} of a reproductive cell with another similar one to form the cell that develops into a new individual) 

X-ray crystallography
The method of using X-rays-diffraction for obtaining an exact picture of atoms in molecules to determine the structure of crystals or molecules.

x-ray-noun
relatively high energy photon with wavelength in the approximate range from 0.01 to 10 nanometers; a  stream of such photons, used for their penetrating power in radiography, radiology, radiotherapy, and scientific research; also called roentgen ray
transitive verbs-x-rayed, X-rayed, x-raying,  X-raying, x-rays  X-rays
to irradiate with x-rays; to photograph with x-rays

yin and yang-nouns
the passive (yin) and active cosmic principles (from Asian dualistic philosophy)

yearning-noun
a persistent, often wistful or melancholy desire; a longing (the yearnings for romance and adventure that are awakened by spring).
yearn, yearned, yearning, yearns-intransitive verbs
to have a strong, often melancholy desire; to feel deep pity, sympathy, or tenderness (yearned over the poor child's fate)
yearner-noun
yearningly-adverb

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