English
pseudothumb
From pseudo- + thumb.
Today it means
noun A digit on a vertebrate that resembles but is not a thumb.
Sources
Sources: Wiktionary, “pseudothumb”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / pseudothumb