Chiliad is a 7 letter English word. It's valid Scrabble word worth 13 points. It's valid Words with friends word worth 14 points.
You can make 112 anagrams from letters in chiliad (acdhiil).
1590-1600; Late Latin chīliad- (stem of chīlias) Greek, equivalent to chī́li(oi) 1000 + -ad- -ad1
These probably included the logarithms of the first chiliad which he published in 1617.
Or, from the Greek, chiliad; and hence the word chiliasm, expressing the belief in a millennium.