Learn how to say Cactus correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word cactus:
noun (plural cacti /-tʌɪ/ or cactuses)
a succulent plant with a thick fleshy stem which typically bears spines, lacks leaves, and has brilliantly coloured flowers. Cacti are native to arid regions of the New World and are cultivated elsewhere, especially as pot plants.
Family Cactaceae: numerous genera and species
Pronunciation: /-ˈteɪʃəs/ adjective
early 17th century (in the sense ‘cardoon’): from Latin, from Greek kaktos ‘cardoon’
The plural of cactus can be spelled either cactuses or cacti (as in the original Latin).