dilatations

ˌdʌɪleɪˈteɪʃ(ə)n
dɪleɪˈteɪʃ(ə)n
ˌdʌɪləˈteɪʃ(ə)n
ˌdɪləˈteɪʃ(ə)n

noun

the action of dilating a vessel or opening or the process of becoming dilated.