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indicator is a topic covered in the Taber's Medical Dictionary.

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(in″dĭ-kāt′ŏr )

[L. indicare, to show]
In chemical analysis, a substance that can be used to determine pH. In a more general sense, any substance that can be used to determine the completeness of a chemical reaction, as in volumetric analysis. SEE TABLE: Colors of Indicators of pH
Colors of Indicators of pH

Toward AcidToward AlkaliRange of pH
Methyl yellowRedYellow2.9-4.0
Congo redBlueRed3.0-5.2
Methyl orangeRedYellow3.1-4.4
Methyl redRedYellow4.2-6.2
Bromcresol purpleYellowPurple5.2-6.8
Bromothymol blueYellowBlue6.0-7.6
Phenol redYellowRed6.8-8.4

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Venes, Donald, editor. "Indicator." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Taber's Online, www.tabers.com/tabersonline/view/Tabers-Dictionary/752590/all/indicator.
Indicator. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://www.tabers.com/tabersonline/view/Tabers-Dictionary/752590/all/indicator. Accessed August 22, 2019.
Indicator. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://www.tabers.com/tabersonline/view/Tabers-Dictionary/752590/all/indicator
Indicator [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2019 August 22]. Available from: https://www.tabers.com/tabersonline/view/Tabers-Dictionary/752590/all/indicator.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - indicator ID - 752590 ED - Venes,Donald, BT - Taber's Medical Dictionary UR - https://www.tabers.com/tabersonline/view/Tabers-Dictionary/752590/all/indicator PB - F.A. Davis Company ET - 23 DB - Taber's Online DP - Unbound Medicine ER -