English
interpenetrable
From inter- + penetrable.
Formed from inter- + penetrable
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Latin penetrō ‘to enter, penetrate’
Medieval Latin penetrābilis
Old French penetrable
Middle English penetrable
English penetrable
Today it means
adj That can be interpenetrated
Language periods are conventional ranges, not dates for this word.
Etymograph / interpenetrable