IPA: /sʌbˈdɜːrməli/
KK: /sʌbˈdɜrməli/
In a way that is located or occurs beneath the skin.
The medication was administered subdermally to ensure it absorbed slowly into the bloodstream.
Subdermally → It is formed from "sub-" (meaning under) and "derma" (from Greek "derma", meaning skin) and the suffix "-ally" (meaning in a manner). The word "subdermally" means in a manner that is under the skin.
Think of something that is 'under' ('sub-') the 'skin' ('derma') — that's why subdermally refers to something happening beneath the skin.