The spelling of the word "Bactrldium" is a bit tricky as it contains some letters that aren't typically used in English language words. The pronunciation of this word can be broken down using the International Phonetic Alphabet (IPA) as /bækˈtrɪldiəm/. The "c" in "Bactrldium" is actually pronounced as a "k" sound, while the "r" is also a bit unique, being pronounced with a trill or roll of the tongue. Overall, while the spelling of "Bactrldium" may look daunting, its pronunciation can be easily understood with a little guidance.
A term formerly used as a generic name for the immotile rod-shaped bacteria, now called by some Bacterium, as distinguished from the motile Bacillus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.