Holiday Corp. adopted a so-called “poison pill.”

Holiday said the adoption of the anti-takeover provision had nothing to do with a stock purchase by New York developer Donald Trump. “The effect is to dilute the stock unless the stockholders are offered a fair price,” said John Onoda of the company’s public relations office. Dan Dorfman, a nationally syndicated columnist, reported last week that Trump was planning a takeover attempt. Trump and Holiday were partners until last year in an Atlantic City, N.J., casino hotel. After a dispute over design and management, Trump bought out the hotel chain’s interest for $73 million.