What does 凸 (tū) mean in English?

Card 2617HSK Level 42617/3571
CARD2617
PROGRESS73%
凸
tū
protruding(Adjective)
Click to reveal
← Previous↑ DeckNext →

Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d