Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vindēmĭo, āre, v. n. [vindemia], to gather grapes, gather the vintage (post-Aug.); absol.: jam et Calend. Jan. vindemiantes vidi, Plin. 18, 31, 74, § 319; 35, 10, 37, § 310.
With a homogeneous object: vinum, Col. 12, 33, 1: uvas, Plin. 14, 2, 4, § 30.