that's because galaxy is another greek word, not a latin one..

the greeks have dessert. galacto.....(galacto is enough to remember to find it on a menu)

its a 'milk (custard) cake' today, its more common to see lacto--as 'root' word for milk/(milk products). but galact or galax is also used (in the greek) and the same lacto (milky) word is at the root of galaxy.. our galaxy is the milky way, (and galaxy also means milky ...)

its like the round robin meaning played between seat and chair. with see (a religious group) and cathederal (the home church of biship, who has a chair, and is charged with a see... (with lots of connections i am forgetting the details of, right now)

i remember reading dictionaries before high school (i clearly remember the horrid summer when my dictionary reading habit was discovered.. i was trying that summer to 'fit in' and be normal. when it was discovered i carried a pocket dictionary with me.. well i was unmasked as a nerd.