shaped somewhat like a string of beads; specif., consisting of, or having, a series of alternate swellings and constrictions, as some plants stems and some insect antennae
See moniliform in American Heritage Dictionary 4
(mō-nĭlˈə-fôrmˌ)
adjective
Resembling a string of beads, as the roots of certain plants or the antennae of certain insects.