LBD is a an umbrella term for two related clinical diagnoses, dementia with Lewy bodies and Parkinson's disease dementia. The latest clinical diagnostic criteria for dementia with Lewy bodies (DLB) categorizes symptoms into three types, listed below. A diagnosis of Parkinsons' disease dementia (PDD) requires a well established diagnosis of Parkinson's disease that later progresses into dementia, along with very similar features to DLB.
The meaning of LBF is: Later, best friend . Find more definitions for LBF on Slang.org!
In the English system, the force unit is the pound-force ($lbf$) and is defined as the force required to accelerate a mass of $32.174\cdot lbm$ (1 slug) at a rate of $1\cdot\frac{ft}{s^2}$. That is... $$1\cdot N = 1\cdot kg\times1\cdot\frac{m}{s^2}$$. $$1\cdot lbf = 32.174\cdot lbm\cdot\times1\cdot\frac{ft}{s^2}$$.