1. Plural of cyclopaedia; comprehensive reference books or collections of articles covering many subjects or one particular subject, arranged alphabetically.
Usage: Chiefly British spelling; American English typically uses 'encyclopedias'; Often used to refer to historical or classical encyclopedic works

Examples

• The library's collection of cyclopaedias from the 18th century provided valuable historical information.
• She consulted several cyclopaedias to research the topic thoroughly.
• Victorian cyclopaedias were prized possessions in educated households.
• The old cyclopaedias on the shelf contained fascinating articles about natural history.
• Before the internet, families relied on cyclopaedias for general knowledge and learning.