There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.
back, backrest
(noun) a support that you can lean against while sitting; “the back of the dental chair was adjustable”
Source: WordNet® 3.1
backrest (plural backrests)
The back piece of a chair, used to support the sitter's back.
A guide attached to the slide rest of a lathe, and placed in contact with the work to steady it in turning.
• Starbeck, backster, brackets
Source: Wiktionary
21 June 2025
(noun) the condition of being deprived of oxygen (as by having breathing stopped); “asphyxiation is sometimes used as a form of torture”
There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.