helo-
I.combining form 
Etymology: New Latin, from Greek helos — more at helodes 
 : marsh : bog 
< helobious >
< helophyte >
II.combining form 
Etymology: New Latin, from Greek hēlo-, from hēlos; perhaps akin to Latin vallus stake, palisade — more at wall 
 : nail 
< Heloderma >
< Helotium >
I.
< helobious >
< helophyte >
II.
< Heloderma >
< Helotium >