conditioner

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One that conditions, especially an additive or application that improves the quality or usability of a substance: a soil conditioner; a hair conditioner.

Century Dictionary and Cyclopedia

1. n. In milling, a machine for drying damp or musty grain and bringing it into proper condition for use. It consists of a tall tower, the upper part of which is formed of a series of circular blinds and the lower part (one third) of woven-wire netting. Inside the tower, and extending throughout its length, is a pipe or cylinder of perforated sheet-metal. The damp grain is fed into the top of the tower, and falls to the bottom in a cylindrical sheet between the outside blinds and netting and the central perforated metal pipe. In falling, the grain is first exposed to a heavy blast of hot air which passes through the perforations in the central pipe, escaping through the grain and the blinds to the open air. Falling still lower, it meets a blast of cold air, which, passing through the falling grain, escapes through the wire netting. The heating, drying, and cooling leave the grain clean, dry, and in good condition.

Wiktionary

1. n. anything that improves the condition of something
2. n. hair conditioner
3. n. someone who trains athletes

GNU Webster's 1913

1. n. exercise that conditions the body.
2. n. a trainer of athletes.
3. n. a substance used in washing (clothing or hair) to make things softer.

WordNet 3.0

1. n. a trainer of athletes
2. n. exercise that conditions the body
3. n. a substance used in washing (clothing or hair) to make things softer