Webster's 1913 Dictionary
FLUORESCEIN
FLUORESCEIN Flu `o *res "ce *in, n. (Chem. )
Defn: A yellowish red, crystalline substance, C2 H12O5, produced by heating together phthalic anhydride and resorcin; -- so called, from the very brilliant yellowish green fluorescence of its alkaline solutions. It has acid properties, and its salts of the alkalies are known to the trade under the name of uranin.
New American Oxford Dictionary
fluorescein
fluo res ce in |flo͝o (ə )ˈresēən, flôrˈesēən ˌflʊəˈrɛsiən | ▶noun Chemistry an orange dye with a yellowish-green fluorescence, used as an indicator and tracer. [A derivative of resorcinol and phthalic anhydride; chem. formula: C 20 H 12 O 5. ] ORIGIN late 19th cent.: from fluorescence + -in 1 .
Oxford Dictionary
fluorescein
fluorescein |ˈflʊərəsiːn, -sɪn, ˈflɔː -| ▶noun [ mass noun ] Chemistry an orange dye with a yellowish-green fluorescence, used as an indicator and tracer. ●A derivative of resorcinol and phthalic anhydride; chem. formula: C 20 H 12 O 5. ORIGIN late 19th cent.: from fluorescence + -in 1 .
Duden Dictionary
Fluorescein
Flu o res ce in Substantiv, Neutrum , das Fluorescin |Fluoresce i n |das Fluorescein; Genitiv: des Fluoresceins zu Fluoreszenz gelbroter Farbstoff, dessen verdünnte Lösung stark grün fluoresziert
The Wordsmith Dictionary