ˈseks+ˌ- noun
Etymology: sex- + foil
1.
a. : a flower with six perianth segments
b. : a leaf with six leaflets
c. : a group of six leaves
2. : a figure enclosed by six joined foils ; specifically : a 6-lobed foliation in Gothic tracery
3. : a conventionalized heraldic flower showing six lobe-shaped petals