What is the meaning of -di?

a noun-forming suffix

near-future verb suffix

a third-person plural possessive suffix

collective suffix usually attached to plant names

group of people

present passive infinitive of -dō

at

times

past tense suffix

used in nouns to indicate that it has been seen in the past; equivalent to English was — were

used to form past tense of verbs

Source: wiktionary.org