'armeniaceous' originates from New Latin, specifically the word 'Armeniaca', combined with the Latin-derived suffix '-aceous' (from '-aceus'), where 'Armeniaca' referred to the apricot genus (ultimately from 'Armenia') and '-aceus' meant 'of or pertaining to'.

'armeniaceous' changed from the New Latin formation 'Armeniaceus' (used in botanical Latin to mean 'of or pertaining to Armeniaca') and eventually became the modern English adjective 'armeniaceous'.

Initially, elements of the word signified origin or relation to 'Armenia' (via the genus name), but over time it evolved into the specialized botanical meaning 'pertaining to the genus Armeniaca or apricot-like'.