noun /dí/ high-tone /dī/ mid-tone /dì/ low-tone
Definitions
  1. The name of the Latin script letter D/d.
Other entries with this spelling
Wiktionary records 2 entries spelled “dí”. You're reading one of them; here are the others.
Source: Wiktionary · etymology 1, where this word is spelled “di”. Reference: en-di-yo-noun-ErjmsrWC