From Longman Dictionary of Contemporary Englishsundecksun‧deck /ˈsʌndek/ noun [countable] TTWDLTa part of a ship where people can sit in the sun
Examples from the Corpus
sundeck• They entered a large white room with a glass partition at one end which was open to a sundeck.• Facilities include sundeck, pool, restaurant, two bars and lounge, shop, hairdresser and sauna.• From the sundeck one could see a hillside with growths of ponderosa and scores of sparkling amorphous swimming pools.• By the pool and adjacent to the sundeck are small bars for drinks. 