Pen`ta*thi*on"ic(?), a. [Penta- + thionic.] (Chem.) Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; -- so called because it contains five atoms of sulphur.
Pen*tath"lon(?), n. [NL., fr. Gr. ; five + a contest.] (Gr. Antiq.) 1. A fivefold athletic performance peculiar to the great national games of the Greeks, including leaping, foot racing, wrestling, throwing the discus, and throwing the spear.
2. In the modern Olympic Games, a composite contest made up of a running broad jump, throwing the javelin, a 200-meter run, throwing the discus, and a 1500-meter run.
[Webster 1913 Suppl.]
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