15-letter words containing t, a, p, e, r, l
- whip-tailed ray — a whipray.
- winter purslane — a plant, Montia perfoliata, native to western North America, of the purslane family, having edible, egg-shaped leaves and clusters of small, white flowers.
- xenotransplants — Plural form of xenotransplant.
- z-zero particle — one of three particles, called intermediate vector bosons, that are believed to transmit the weak force. Symbol: Z 0.