The word "pillarless" means without pillars or columns. It describes something, such as a building or structure, that does not have any vertical supports in its design. Full definition
Mantra Legends Hotel offers conference organisers a variety of flexible meting rooms including a large pillarless ballroom with attached outdoor terrace and smaller executive boardrooms. (queenslandhotelconferences.com)
Called pillarless design, it's a not just a class - exclusive but a body style only Mercedes - Benz has produced continuously for over 50 years. (orlandpark.mercedesdealer.com)
This was the first year for the New Yorker four - door pillarless hardtop. (en.wikipedia.org)