methyl orange

(redirected from Methylorange)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Methylorange: phenolphthalein, Methyl red


1. the trees Citrus aurantium and Citrus sinensis or their fruits; the flowers and peels are used in pharmaceutical preparations.
2. a color between red and yellow, produced by energy of wavelengths between 590 and 630 nm..
3. a dye or stain with this color.
methyl orange an orange-yellow aniline dye, used as an indicator with a pH range of 3.2–4.4 and a color change from pink to yellow.

meth·yl or·ange

(meth'il ōr'enj),
A weakly acid dye used as a pH indicator (red at 3.2, yellow at 4.4).
Synonym(s): helianthine

methyl orange

A dye used as a pH indicator.
CAS # 547-58-0
See also: methyl