1824, "modify a living thing to suit a foreign climate" (transitive); see acclimate + -ize. A more recent formation than acclimate and generally replacing it in this sense. Related: Acclimatized; acclimatizing. Simple climatize is attested from 1826 as "inure (a living thing) to a climate."
They never acclimatized in Egypt
acclaim
acclamation
acclimate
acclimation
acclimatization
acclimatize
acclivity
accolade
accommodate
accommodating
accommodation