Definition of cyclopentadiene in English:

cyclopentadiene

Syllabification: cy·clo·pen·ta·di·ene
Pronunciation: /ˌsīkləˌpentəˈdīēn, ˌsiklə-/

Entry from US English dictionary

noun

A colorless toxic liquid derived from the distillation of coal tar, insoluble in water, soluble in alcohol, and used in the manufacture of insecticides and resins.

Definition of cyclopentadiene in:

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence