Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
frontālĭa, ĭum, n. [2. frons], an ornament for the forehead, frontlet, of horses, Liv. 37, 40, 4; Plin. 37, 12, 74, § 194; Amm. 23, 4.