IPA: /ˈeɪpɪkəl/
KK: /ˈeɪpɪkəl/
Relating to the tip or highest point of something, especially in linguistics where it refers to sounds made with the tip of the tongue.
In linguistics, the sounds produced by the tip of the tongue are called apical sounds.
Apical is formed from "apex" (from Latin "apicem", meaning tip or summit) and the suffix "-al" (meaning pertaining to). The word "apical" refers to something that is related to or situated at the tip or summit of something.
Think of the 'tip' ('apex') of something, and remember that 'apical' means related to that tip.