antinormal

== English == === Etymology === From anti- +‎ normal. === Pronunciation === (US) IPA(key): /ˈæn.tiˌnɔɹm(ə)l/ === Adjective === antinormal (not comparable) Antagonistic to or causing deviations from that which is considered normal. In the opposite direction or position from what is normal or canonical. (geometry) Perpendicular to a tangent of a curve or tangent plane of a surface but pointing opposite to convention. === Noun === antinormal (plural antinormals) (geometry) A normal that points opposite to convention. For example, in solid geometry it is conventional for normals to point outwards, so an antinormal in solid geometry refers to a normal pointing inwards.