Dictionary.net

• A variety of pseudomorph which has undergone partial or complete change or substitution of material; - thus limonite is frequently an allomorph after pyrite.

2010 - New Age Dictionary Database
By Oddity Software

• A variety of pseudomorph which has undergone partial or complete change or substitution of material; - thus limonite is frequently an allomorph after pyrite.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.