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Algo- is a combining form used like a prefix meaning “pain.” It is occasionally used in medical terms, especially in psychiatry and pathology.

Algo- comes from the Greek á�����Dz�, meaning “pain.” Similar in meaning and use to algo- are odyno- and -odynia, which derive from �ǻ�ý��ŧ, also meaning “pain.”

Corresponding forms of algo- combined to the end of words are -algia, as in ovarialgia, or -algy, as in coxalgy. Learn more about these forms in our �������t¶��s That Use articles for each.

One example of a term that features the combining form algo- is algophobia, “an irrational or disproportionate fear of pain.”

Algo- means “pain,” as we have seen. The -phobia part of the word may also look familiar. It means “fear.” Algophobia literally translates to “fear of pain.”

What are some words that use or are related to the combining form algo-?

• algesia
• algodystrophy
• algogenic
• algolagnia (using the equivalent form of algo- in German)
• algometer
• algophilia

What are some other forms that algo- may be commonly confused with?

• agro-
• allo-
• angio-

Many words that begin with the exact letters algo- or alg- are not using the combining form algo- to denote “pain.” Algorithm, algology, and algae are three examples. Learn more about the history and meaning of these words at our entries for them.

The combining form -meter means “measure.” It is used to name instruments that measure various quantities or qualities. What does an algometer measure?