Definition of palaeo- in English:

palaeo-

Pronunciation: /ˈpalɪəʊ, ˈpeɪlɪəʊ/
(US paleo-)

combining form

Older or ancient, especially relating to the geological past: Palaeolithic palaeomagnetism

Origin

from Greek palaios 'ancient'.

Definition of palaeo- in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal