脂 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
あぶら abura
KUNYOMI 訓読み
シ shi
Examples
肌が脂っぽいのです。I have greasy skin.歯医者で歯についたたばこのヤニを取ってもらうと、費用はどれくらいかかるでしょう?About how much does it cost to have a dentist remove cigarette tar from your teeth?