Answer: ESSENTIAL

AnswerCrossword Clue
ESSENTIALRequired.
essential(of an amino acid or fatty acid) Required for normal growth but not synthesized in the body and therefore necessary in the diet
essentialabsolutely necessary / something absolutely necessary
essential(of a disease) With no known external stimulus or cause; idiopathic
essentialFundamental or central to the nature of something or someone
essentialAbsolutely necessary; extremely important
ESSENTIALLike many nutrients
ESSENTIALRequired
ESSENTIALHardly necessary
ESSENTIALNecessary small bit of enzyme in saltine crackers (9)
ESSENTIALHardly extraneous
ESSENTIALIntrinsic
ESSENTIALBasic
ESSENTIALAbsolutely necessary
ESSENTIALNecessary.
ESSENTIALHighly important.
ESSENTIALKey
ESSENTIALRequisite
ESSENTIALNot optional
ESSENTIALNecessary
ESSENTIALMust-have
ESSENTIALIndispensible
ESSENTIALChief point
ESSENTIALSine qua non
ESSENTIALNeeded