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“pier” in Latin

The English word pier itself goes back to Latin petra.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

pier
Column on which the arch of a bridge is raised, pontis pila (which supported the arch, fornix: locavit pilas pontis in Tiberim, quibus pilis fornices... censores locaverunt, Liv., 40, 51, 4).
A mole, moles, agger: pila (Verg., Vitr., 5, 12).

Quick answer

What is the Latin word for pier?
The usual Latin words for “pier” are mōlēs, agger, pila; also fornix. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.