gazelle
n.— «The term Gazelles usually refers to start-up companies, often in the high-tech sector, growing extremely fast.… In France for instance, “Gazelle” is a label granted to the 2000 fastest-growing companies during two consecutive years.» —“Entrepreneurial finance for fast-growing start-ups: bootstrap & secure bridge financing. Venture Capitalists may help.” by Jeremy Fain Tech IT Easy July 21, 2006. (source: Double-Tongued Dictionary)