the GNU version of the Collaborative International Dictionary of English
adj. Having the form of a serpent.
The Century Dictionary and Cyclopedia
Having the form of a serpent; serpentine; ophidian in structure or affinity; snake-like: said chiefly of reptiles which are not serpents, but resemble them: as, a serpentiform lizard or amphibian.
Word Usage
"Barnes et al. (1985) even went so far as to describe Acrophoca as ‘serpentiform’ (p. 41)."