The difference between Pollex and Thumby
When used as nouns, pollex means the thumb, whereas thumby means a little thumb.
Thumby is also adjective with the meaning: clumsy, awkward, maladroit, not dextrous, all thumbs.
check bellow for the other definitions of Pollex and Thumby
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Pollex as a noun:
The thumb; the first, or preaxial, digit of the forelimb, corresponding to the hallux in the hind limb. In birds, the pollex is the joint which bears the alula or bastard wing.
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Thumby as a noun (slang):
A little thumb;
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Thumby as an adjective:
Clumsy, awkward, maladroit, not dextrous, all thumbs
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Thumby as an adjective:
Dirtied by thumb marks