Abarim Publications' online Biblical Greek Dictionary
The noun πους (pous) means foot (hence one octopus, two octopodes). It stems from the ancient Proto-Indo-European root ped-, from which also came our English word foot (and words like antipode, pedicure, expedite, impede, pajama, pawn, pedal, pedigree, pessimism, pew, pilot and podium).
The foot of an item or organism is its lowest point and the part of which upon it stands and rests. In Greek quite a bouquet of sayings and idiom surrounds the foot, most of it is rather literal and easily interpreted ('put under foot' means to subdue, 'lift the feet' means to get going, 'at one's feet' means to recline in one's close proximity). In our article on the Hebrew counterpart of this word, namely רגל (regel) we have a long look at the often cited assumption that in the Biblical languages feet often euphemize male genitalia.
The noun πους (pous) is used 93 times in the New Testament, see full concordance, and from it derives: