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Quaternary
Open directlyWebster's 1828 Dictionary · 1828 1 of 2
Part of speech: noun (n.)
1. The number four. Boyle.
2. The Quaternary age, era, or formation. See the Chart of Geology.
Webster's 1828 Dictionary · 1828 2 of 2
Part of speech: adjective (a.)
1. Consisting of four; by fours, or in sets of four.
2. Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man.