What is the meaning of Diene?

An organic compound, especially a hydrocarbon, containing two double bonds.

singular present subjunctive of dienen

inflection of dienen:

1. first-person singular present
2. first/third-person singular subjunctive I
3. singular imperative

first-person singular present

first/third-person singular subjunctive I

singular imperative

diene

Source: wiktionary.org