Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
congĕlātĭo, ōnis, f. [congelo], a freezing, congealing (very rare; not ante-Aug.): liquoris, Plin. 31, 3, 21, § 33.
In plur.: brumae, Col. 4, 8, 2.