Medical Dictionary


adj es·sen·tial \i-ˈsen-chəl\

Medical Definition of ESSENTIAL

:  being, relating to, or containing an essence <an essential odor>
:  being a substance that is not synthesized by the body in a quantity sufficient for normal health and growth and that must be obtained from the diet <essential fatty acids>—compare nonessential
:  having no obvious or known cause :  idiopathic <essential disease>
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