centipede
millipedemillipedemillipedemillipedemillipedemillipede
millipede
The word "bipedal" means having two legs (feet).
tripod
centipede
millipead
Centipede means "a hundred feet" which is close.
An 11 letter word having to do with sex is fornication.
'marine'
Gastric.
Table ...
Superstitious