urson (plural ursons)
A species of New World porcupine, Erethizon dorsatum.
• (Erethizon dorsatum): Canadian porcupine, cawquaw, North American porcupine, common porcupine (US)
• rouns
Source: Wiktionary
Ur"son, n. Etym: [Cf. Urchin.] (Zoöl.)
Definition: The Canada porcupine. See Porcupine.
Source: Webster’s Unabridged Dictionary 1913 Edition
12 June 2025
(noun) a decrease in the density of something; “a sound wave causes periodic rarefactions in its medium”
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