IPA: /ˈleɪbiəli/
KK: /ˈleɪbiəli/
In a way that relates to the lips or the labia.
The sound was produced labially, using the lips to create the necessary articulation.
Labially → It is formed from "labium" (from Latin, meaning lip) and "-ally" (meaning in a manner relating to). The word "labially" refers to something that is done in a manner relating to the lips.
Think of 'labium' which means lip, and remember that 'labially' describes something related to the lips.