Definition of acuter:
(adj) :
Intense; sensitive; sharp.
(adj) :
Brief, quick, short.
(adj) :
Urgent.
(adj) :
(medicine) Of an abnormal condition of recent or sudden onset, in contrast to delayed onset; this sense does not imply severity, unlike the common usage.
(adj) :
(medicine) Of a short-lived condition, in contrast to a chronic condition; this sense also does not imply severity.
(adj) :
High or shrill.