This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Associated with or relating to great pain, especially the agony of death.

adj. Of or pertaining to the pain of death

Relating to or occurring during the agony or death-struggle. See the extract.

adj. pertaining to or associated with agony (especially death agonies)

"The final "depressive stage" then enter, dealing with coma, flaccid paralysis, loss of reflexes, agonal gasps, apnea, loss of vital signs, and death. 11 This depressive stage occurs due to central medullary depression and may be related to the acute depletion of neurotransmitters."

agonal gasp   

blunt-force    croupy    heart-wrung    deep-sleep    multisystem    nonproductive    wantedto    thiswider    throat-clearing    least-significant