Guelph

¹ American  

[gwelf] / gwɛlf /

Or Guelf

noun

1. a member of the political party in medieval Italy and Germany that supported the sovereignty of the papacy against the German emperors: opposed to the Ghibellines.

2. a member of a secret society in Italy in the early 19th century that opposed foreign rulers and reactionary ideas.

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Guelph ² American  

[gwelf] / gwɛlf /

noun

1. a city in SE Ontario, in S Canada.

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Guelph ¹ British  

/ ɡwɛlf /

noun

1. a member of the political faction in medieval Italy that supported the power of the pope against the German emperors Compare Ghibelline

2. a member of a secret society in 19th-century Italy opposed to foreign rule

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Guelph ² British  

/ ɡwɛlf /

noun

1. a city in Canada, in SE Ontario. Pop: 106 920 (2001)

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Other Word Forms

• Guelfic adjective
• Guelfism noun
• Guelphic adjective
• Guelphism noun

Etymology

Origin of Guelph

1570–80; < Italian Guelfo < Middle High German Welf name of founder of a princely German family

Example Sentences

For 21-year-old Vedant Vyas, this meant taking an indefinite leave from the University of Guelph in Ontario, Canada, last April so he could work full-time on his AI startup, Opennote.

From The Wall Street Journal • Mar. 22, 2026

Avocados may also help people manage obesity and even prevent diabetes, according to researchers at the University of Guelph, near Toronto.

From MarketWatch • Feb. 7, 2026

Michael von Massow, a professor of agriculture at Guelph University, said fruit juice prices have risen 7.5% from last year due to counter measures on American citrus.

From BBC • Aug. 1, 2025

The senior author is Professor Tami A. Martino, PhD, distinguished chair in molecular and cardiovascular research at the University of Guelph in Ontario, Canada.

From Science Daily • Mar. 14, 2024

Florence was fortified against him, and the mutual hatred of Guelph and Ghibelline was easily renewed.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 3 "Helmont, Jean" to "Hernosand" by Various