ˌpēsəˈlīəˌdē noun plural
Usage: capitalized
Etymology: New Latin, from Poecilia, type genus (from Greek poikilia condition of being marked with various colors, from poikil- poecil- + -ia -y) + -idae
: a large family of small New World viviparous fishes (order Microcyprini) comprising the topminnows and having the male anal fin modified as a copulatory organ — compare guppy , swordtail