Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ĕquŭlus, i, m. dim. [equus], a small young horse, a foal, Varr. R. R. 2, 7, 13; 2, 8 fin.; * Cic. N. D. 2, 14, 38.