subingression
/(ˌ)sʌbɪnˈɡrɛʃn/ /(ˌ)sʌbɪŋˈɡrɛʃn/rare after the 17th cent
noun
Subtle or unobserved entrance. Also: an instance of this; (in later use concrete ) a secret or hidden entrance.
- In early use in scientific contexts..
Origin
Mid 17th century; earliest use found in Walter Charleton (1620–1707), physician and natural philosopher. From sub- + ingression.