Answer: ductal

AnswerCrossword Clue
ductalpipe or tubular runway for carrying an electric power line, telephone cables, or other conductors
ductaltube or elongated cavity (as a xylem vessel) in plant tissue
ductalmade up of ducts
ductallayer (as in the atmosphere or the ocean) which occurs under usually abnormal conditions and in which radio or sound waves are confined to a restricted path
ductala bodily tube or vessel especially when carrying the secretion of a gland
ductalpipe, tube, or channel that conveys a substance