TRIGONAL
\tɹˈɪɡənə͡l], \tɹˈɪɡənəl], \t_ɹ_ˈɪ_ɡ_ə_n_əl]\
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2011
- English Dictionary Database
By DataStellar Co., Ltd
2010
- New Age Dictionary Database
By Oddity Software
1913
- Webster's Revised Unabridged Dictionary
By Noah Webster.