Lewis Short
(adjective) : nītĭbundus, a, um, nitor
* Pressing against, straining, striving (post-class.): mentium conspiratu tacito nitibundi,relying upon,Gell. 1, 11, 8: pondus nitibundum,oppressive weight, weighty pressure,Sol. 25, 12: caput,id. 27, 29.
Charlton T. Lewis, Charles Short, A Latin Dictionary