"having no feet," 1769, with -al + Greek apous (genitive apodos) "footless," from a- "not, without" (see a- (3)) + pous "foot" (from PIE root *ped- "foot").
eels are apodal
apo koinu
apocalypse
apocalyptic
apocrypha
apocryphal
apodal
apodictic
apodyterium
apogee
apolitical
Apollo