arsenic
砒 centers on the chemical element arsenic, a toxic metalloid. The meaning is narrow and technical, with no common abstract extensions.
砒 combines 石 (stone, mineral) with 比, which likely contributes the sound. The character was created to name the mineral arsenic.
The stone 石 on the left hints at a mineral, and the right side 比 looks like two spoons side by side. Imagine a pair of spoons made of a dangerous gray stone: that stone is arsenic.
For ヒ, picture a heap of gray arsenic powder: heap -> ヒ, and the stone-like mineral is piled up.
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gallium arsenide (GaAs)
Gallium Arsenide Phosphide; GaAsP
gallium arsenide semiconductor
arsenious acid; arsenous acid (H3AsO3)
arsenite
arsenic trioxide; white arsenic (As2O3)
gallium arsenide (GaAs)
arsine
arsenide
arsenic mineral; arsenious anhydride
arsenicals (drugs containing arsenic)
domeykite
arsenopyrite; mispickel; arsenical pyrite
enargite
native arsenic; arsenic