Mid 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist. From classical Latin pari-, alternative stem of pār equal, a pair + -al.
Definition of parial in US English:
parial
adjectiveˈpɛːrɪəl
rare
Belonging to or constituting a pair; paired.
Origin
Mid 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist. From classical Latin pari-, alternative stem of pār equal, a pair + -al.