pipe / a wind instrument

tube; pipe; duct; tract

a pipe or tube, such as that made of bamboo, wood, metal, or rubber / a shuttle for weaving with a loom (from the way the earliest shuttles were made from bamboo tubes)

(slang, computing) server administrator

(anatomy) ureter

(ornithology) syrinx

(electronics) tetrode (vacuum tube)

(electronics) triode (vacuum tube)

(electronics) Nixie tube

a cul-de-sac / blind pouch