Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

The word oscillare could not be parsed. Trying a normal dictionary lookup:

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oscillans, antis, subst., v. oscillo fin.

oscillātĭo, ōnis, f. [oscillo], a swinging (post-Aug.), Petr. 140, 9: dies festus oscillationis, a festival celebrated at Athens in honor of Erigone, Hyg. Fab. 130.

oscillo, āre, v. n. [2. oscillum], to swing, swing one’s self: oscillum Santra dici ait, quod oscillent, id est inclinent, praecipitesque in os ferantur, Fest. p. 194, 9 and 10 Müll.
Pass.: osculor, Mythogr. Lat. 1, 19 fin.
Hence, oscillans, antis, P. a.; as subst., a swinger: oscillantes, ait Cornificius, ab eo, quod os celare soliti personis propter verecundiam, qui eo genere lusūs utebantur, Fest. p. 194 Müll.