A very lean person, especially one whose bones show through the skin(noun)
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Use "barebone" in a sentence
"The basic building block of a DIY notebook is what's called a barebone system."
"Unfortunately, pricing for the LizardQ system is extremely high, since LizardQ panoramic cameras are available as a "barebone" and as a complete system, the "bare-bone" selling for around 22.100 Euro."
"Building upon the X27's "barebone" configuration, the X270V fills one of the two empty bays with a 2. 5-inch, 160GB hard disk drive (HDD), while the other bay is designed to hold a slimline 5. 25-inch DVD burner optical disk drive."