IPA: /sʌbˈɡleɪʃəli/
KK: /sʌbˈɡleɪʃəli/
In a way that occurs beneath a glacier or ice.
The researchers studied the water flow subglacially to understand its impact on glacier movement.
Subglacially → It is formed from "sub-" (meaning under) and "glacies" (from Latin, meaning ice) and the suffix "-ally" (meaning in a manner). The word describes something that occurs in a manner that is under the ice.
Think of being 'under' ('sub-') the 'ice' ('glacies') — that's why subglacially refers to something happening beneath the ice.