The Collaborative International Dictionary of English v.0.48:

Aspirin \As"pi*rin\, n. (Pharm.)
   A white crystalline compound, acetyl salicylic acid
   (CH3.CO.O.C6H4.CO.OH) widely used as a drug for relief of
   pain and alleviation of fever. It has analgesic, antipyretic,
   and antiinflammatory properties, and is one of a class of
   agents called non-steroidal antiinflammatory drugs (NSAIDs).
   The name was originally a trade name, but has become the
   preferred name for the substance. It is actually a prodrug,
   liberating salicylic acid, the ultimate pharmacologically
   active agent, in the intestines. It is more effective when
   taken orally than is salicylic acid, because it dissolves
   more readily.

   Syn: 2-(acetyloxy)benzoic acid
        [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

aspirin
    n 1: the acetylated derivative of salicylic acid; used as an
         analgesic anti-inflammatory drug (trade names Bayer,
         Empirin, and St. Joseph) usually taken in tablet form; used
         as an antipyretic; slows clotting of the blood by poisoning
         platelets [syn: aspirin, acetylsalicylic acid, Bayer,
         Empirin, St. Joseph]

The Free On-line Dictionary of Computing (30 December 2018):

Aspirin
bpmake

    A freeware language from MITRE
   Corporation for the description of neural networks.  A
   compiler, bpmake, is included.  Aspirin is designed for use
   with the MIGRAINES interface.

   Version: 6.0, as of 1995-03-08.

   (ftp://ftp.cognet.ucla.edu/alexis/).

   (1995-03-08)