Answer: thirteen

AnswerCrossword Clue
THIRTEENTriskaidekaphobic item
thirteenThirteen years old
thirteena number
thirteenEquivalent to the sum of six and seven; one more than twelve, or seven less than twenty; 13
thirteenA size of garment or other merchandise denoted by thirteen
THIRTEENMissing button in many an elevator
THIRTEENUncommon elevator button
THIRTEENFloor number absent in many high-rises
THIRTEENIt's not Lady Luck's number
THIRTEENMissing hotel floor?
THIRTEENNot Lady Luck's number
THIRTEENBaker's dozen quantity
THIRTEENLong dozen
THIRTEENLong dozen, to bakers
THIRTEENThurber's "The ... Clocks"
THIRTEENOriginal number for a nation
THIRTEENChild's milestone age
THIRTEENImportant age.
THIRTEENSymbol of bad luck.
THIRTEENWhat a triskaidekaphobe fears.
THIRTEENSymbol of an ancient superstition.
THIRTEENMissing floor in many hotels.
THIRTEENTriskaidekaphobe's fear
THIRTEENBaker's dozen
THIRTEENCoven count