Meaning of pseudothumb | Babel Free

Definitions

A digit on a vertebrate that resembles but is not a thumb.

Examples

“But a panda's forepaws are specially adapted for manipulating bamboo stems, with a modified elongated wrist bone forming the pseudothmb covered by a fleshy pad.”

“The extra digit is a "pseudothumb” containing a sheathed spine that can be pushed out.”

“There are also at least two examples of more complex ectopic digits. The first is in the aye-aye, a Madagascan lemur, which has a distinct pseudothumb on its forelimb consisting of a bony part that is an expanded radial sesamoid and a dense cartilaginous extension (Hartstone-Rose et al., 2019). This pseudothumb receives attachments from muscles that facilitate abduction, adduction, and opposition, which together facilitate dexterity.”

CEFR level