ingressive

A speech sound in which the air stream is created by drawing air in through the mouth or nose.

Going or directed inward, entering.

Open to entry or examination.

“The chances that your Internet activity is being monitored are low, despite the ingressive nature of the modern Internet environment.”

(of a speech sound) Uttered by drawing air inward through the mouth or nose.

(grammar) Aspectually indicating that an action is about to be entered or is in the process of being entered.

Being a source or channel through which water enters or once entered an area.

“This spring is the ingressive source of the water that flows through the cave.”