Synonyms for Assimilating (same or very similar meaning)
WordNet sense 1 (capable of taking (gas,light, or liquids into a solution) ):
assimilative, assimilatoryWordNet sense 2 (having power or capacity or tendency to absorb or soak up something (liquids or energy etc.)):
absorbent, absorptiveFrom the ODE community, based on WordNetadd/edit