pipestem noun3 •The hollow stem or tube of a pipe used for smoking tobacco, etc. •A driveway that leads to multiple residences, often maintained or owned jointly by the residents along the driveway; a shared driveway.Although Washburn defined the house location as a cul-de-sac rather than a pipestem, it was a shared driveway off a main road with all the mailboxes grouped together at the entrance to the main road. — 2004 •The pale bridewort (Spiraea alba). formspipestems