(chemistry) olefiant gas, or ethylene / (chemistry, by extension) any of the series of unsaturated hydrocarbons of which ethylene is a type

(tennis) An official who watches the lines of the court and judges whether the ball has landed in or out and also declares foot faults.

(derogatory) Language used by political liberals; liberalese.

Relating to finches of the genus Coccothraustes