A sanctuary or informal church; part of a cathedral or large church; or a separate and detached place of worship. The earliest oratories or chapels, as distinct from the buildings where the bishop and presbytery presided over the regular assemblies of Christians, were probably martyrs memorials. The spread of Christianity from the cities into the country must have early occasioned the erection of chapels for believers living at a distance from the bishop's church. Chapels were built in private homes and in the course of time many became regular parish churches. Other buildings such as courthouses, hospitals, and all religious houses had chapels attached to them in medieval times. The most important kinds of chapels include:

ambassadors' chapel
bishops' chapel
bridge chapels
cemetery or mortuary chapels
chantry
chapels of ease
chapels of repose
charnel chapels
gate-house chapels
Lady chapels
papal chapels
royal chapels
ship chapels
votive chapels
wayside chapels

Bibliography Information
Entry for 'Chapel'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/c/chapel.html. 1910.

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1910 New Catholic Dictionary

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Chapel