ambŭlātĭuncŭla, ae, dim. f. [ambulatio], a short walk (perh. only in the foll. passages of Cic.).
I Lit., Cic. Fam. 2, 12. —And,
II Concr., a small place for walking : tecta, Cic. Att. 13, 29.
ambulātiuncula ae, dim, f. ambulatio, a short walk, little promenade.—A portico : tecta. ...
An Elementary Latin Dictionary