What is Palaeocurrent?

Palaeocurrent definition and meaning on Dictionary terms:
verb (used with object), palA.aA.talA.ized,
to articulate (a consonant other than a normal palatal) as a palatal or with relatively more contact between the blade of the tongue and the hard palate, as in certain pronunciations of the l-sound in million.

verb (used without object), palA.aA.talA.ized,
(of a consonant) to undergo palatalization.