Transient

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Transient

1. short-lived; passing; not permanent; said of a disease or an attack.

2. A short-lived cardiac sound having little duration (less than 0.12 second) as distinct from a murmur; e.g., first, second, third, and fourth heart sounds, clicks, and opening snaps.

Origin: L. Transeo, pres. P. Transiens, to cross over