ISTANBUL: The Turkish lira weakened slightly to a new record low against the dollar on Wednesday as unease about the economic outlook persisted, while investors awaited the US Federal Reserve's latest policy announcement.

The Turkish currency, which touched a low of 7.5020, has been edging lower recently and has been hit this week by a Moody's downgrade of the sovereign rating to 'B2' from 'B1'. It has weakened 21% this year.