(in Latin) a verbal adjective similar to the gerund in form and noting the obligation, necessity, or worthiness of the action to be done, as legendus in Liber legendus est, “The book is worth reading.”
–adjective
2.
resembling a gerund.
Origin: 1375–1425; late ME < LL gerundīvus.See gerund, -ive
[juh-ruhn-div] 
dɪv