de·lir·i·um (d -lîr  - m)n. pl. de·lir·i·ums or de·lir·i·a (- -) 1. A temporary state of mental confusion and fluctuating consciousness resulting from high fever, intoxication, shock, or other causes. It is characterized by anxiety, disorientation, hallucinations, delusions, and incoherent speech. 2. A state of uncontrolled excitement or emotion: sports fans in delirium after their team's victory. [Latin d l rium, from dlr re, to be deranged : d-, de- + lra, furrow; see leis-1 in Indo-European roots.]de·lir i·ant adj. |
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