IPA: /ˌmʌl.tɪˈtjuː.dɪ.nəs/
KK: /mʌlˈtɪtʃʊdɪnəs/
Having a large number of parts or elements; very numerous.
The garden was filled with multitudinous flowers of every color.
Multitudinous → It is formed from "multus" (meaning many) and "-tudo" (a suffix indicating a state or condition) combined with the suffix "-ous" (meaning full of). The word "multitudinous" means full of many or numerous.
Think of 'many' ('multus') and remember that 'multitudinous' means full of many things.