Pronunciation: (pen'i-trā"ting), [key]
1. able or tending to penetrate; piercing; sharp: a penetrating shriek; a penetrating glance.
2. acute; discerning: a penetrating observation.
3. Surg.noting a wound that pierces the skin, esp. a deep wound entering an organ or body cavity. Also,penetrant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.