Snowflake \Snow"flake`\, n. 1. A flake, or small filmy mass, of snow. 2. (Zo["o]l.) See {Snowbird}, 1. 3. (Bot.) A name given to several bulbous plants of the genus {Leucoium} ({L. vernum}, {[ae]stivum}, etc.) resembling the snowdrop, but having all the perianth leaves of equal size.