(chemistry) A short chain aliphatic carboxylic acid, CH₃(CH₂)₃COOH, obtained from the roots of valerian; used in perfume, flavourings, pharmaceuticals

A tunnel forming part of a larger tunnel or tunnel system.

(computing) The actual time of day, as would be seen on a wall clock; contrasted with the (possibly inaccurate) time according to a computer system.

plural of ganoidian