cath-

1.
variant of cata- before an aspirate:
cathode.
British Dictionary definitions for cath-

cata-

prefix
1.
down; downwards; lower in position: catadromous, cataphyll
2.
indicating reversal, opposition, degeneration, etc: cataplasia, catatonia
Word Origin
from Greek kata-, from kata. In compound words borrowed from Greek, kata- means: down (catabolism), away, off (catalectic), against (category), according to (catholic), and thoroughly (catalogue)

cath-

prefix
1.
a variant of cata- cathode