Definition of posteriad in US English:

posteriad

adverb

Anatomy Zoology
  • Towards the posterior part or surface of the body; to the rear of; posteriorly. Opposed to anteriad.

Origin

Early 20th century; earliest use found in Transactions of the American Microscopical Society. From posteri- + -ad.

Pronunciation

posteriad

/pɒˈstɪərɪad/