Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rāmŭlus, i, m. dim. [ramus], a little branch or bough, a twig, sprig, Cato, R. R. 101; Cic. Div. 1, 54, 123; Plin. 24, 15, 81, § 132; 27, 12, 88, § 111 al.