单词 | ammoniac |
释义 | Word Frequency ammoniac(əˈməʊnɪˌæk) or ammoniacum (əˌməʊnɪˈækəm) noun a strong-smelling gum resin obtained from the stems of the N Asian umbelliferous plant Dorema ammoniacum and formerly used as an expectorant, stimulant, perfume, and in porcelain cement Also called: gum ammoniacWord origin C14: from Latin ammōniacum, from Greek ammōniakos belonging to Ammon (apparently the gum resin was extracted from plants found in Libyanear the temple of Ammon) |
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