LATIN DICTIONARYLexicon Latīnum
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“filial” in Latin

The English word filial itself goes back to Latin fīlius, through fīliālis.

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

filial
pius erga parentes, etc. (with reference to behavior toward parents, relations, etc.; “erga parentes,” etc., may also be left out, if it can be understood from the context); also circumlocution by genitive, liberorum; e.g., it is a filial duty, est liberorum: filial love or affection, pietas erga parentes, etc.; Vid: the remark on “pius”: to cherish with filial affection, perhaps aliquem pie or pietate colere (a father, a mother); aliquem patris (matris) loco colere (i. e., as a father or a mother).

Quick answer

What is the Latin word for filial?
The usual Latin words for “filial” are līber, māter. 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.