Word Study
gerundive
CIDE DICTIONARY
gerundive, a. [L. gerundivus.].
Pertaining to, or partaking of, the nature of the gerund; gerundial. [1913 Webster]
OXFORD DICTIONARY
gerundive, n. Gram. a form of a Latin verb, ending in -ndus (declinable) and functioning as an adjective meaning 'that should or must be done' etc.
Etymology
LL gerundivus (modus mood) f. gerundium: see GERUND
For further exploring for "gerundive" in Webster Dictionary Online