noun

• (botany) One of the component parts of the corolla of a flower. It applies particularly, but not necessarily only, when the corolla consists of separate parts, that is when the petals are not connately fused. Petals are often brightly colored.
• (euphemistic, hypocoristic) The labia (majora).
  "Dawn held her breath, fearing he'd notice the slight protrusion where her babe rested beneath her heart, but he barely paused as his mouth found the tiny jewel hidden within the dewy petals of her sex."
• (geometry) A lobe of a rose (geometric shape).

verb

• (ambitransitive) To spread out from, like the petals of a flower
  "anger against the men who had burdened her body with a lead shield of detestation for its blood, let loose without her will and its need against which she clenched her knees to her growing breasts, trying to clasp deep away from her hand that new soft wedge of hair, those lips that petaled out to her dreams."