ingressive

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or involving ingress.
• adjective Grammar Inchoative.
• adjective Linguistics Of or being a speech sound produced with an inhalation of breath.

from The Century Dictionary.

• Entering; denoting entering on or beginning.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective going or directed inward, entering
• adjective open to entry or examination
• adjective phonetics, of a speech sound Uttered by drawing air inward through the mouth or nose.
• adjective geology descriptive of a source or channel through which water enters or once entered an area.
• noun phonetics A speech sound in which the air stream is created by drawing air in through the mouth or nose.