2. Adjective. (phonetics of a speech sound) Uttered by pushing air out through the mouth or nose. ¹
3. Adjective. (geology) descriptive of a place or channel through which something such as water or lava leaves an area. ¹
4. Noun. (phonetics) A speech sound in which the air stream is created by pushing air out through the mouth or nose. ¹
¹ Source: wiktionary.com