Found 12 phrases starting with X:

X factor	An unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences.	Rate it:
X factor	prothrombinase, also called factor X.	Rate it:
X factor	The proportionality constant which converts CO emission line brightness to molecular hydrogen mass.	Rate it:
X marks the spot	You will find what you are looking for under an obvious sign for it.	Rate it:
X out	to cross out with letter X's, or with scribble, or with lines.	Rate it:
x ray	medical photograph	Rate it:
X's and O's	tic-tac-toe	Rate it:
X's and O's	The fundamental elements of a play.	Rate it:
X's and O's	The basic delineation of roles in a project.	Rate it:
X's and O's	kisses and hugs.	Rate it:
XFF	Initialism of X-Forwarded-For : an HTTP header indicating that a message or request was forwarded by a proxy.	Rate it:
XYZ	The color space of the tristimulus values X, Y, and Z.	Rate it:

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