"water-loving"; refers both to stationary phases that are compatible with water and to water-soluble molecules in general. Most columns used to separate proteins are hydrophilic in nature and should not sorb or denature protein in the aqueous environment.

(Hydro = water; Phillia = love) having an affinity for water.

An affinity toward water (water loving).  A hydrophilic surface allows water to spread across it in large puddles.

Attracting moisture.