adj

• (phonetics, of a speech sound) Uttered by drawing air inward through the mouth or nose.
  "Another feature of Icelandic pronunciation that many learners remark on is that sometimes words, and even larger parts of sentences, are pronounced while inhaling (a phenomenon known as pulmonic ingressive pronunciation)."
• (grammar) Aspectually indicating that an action is about to be entered or is in the process of being entered.
• (geology) 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."

noun

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