(bound form) to prick or sting; specifically used in the compound 棘手 jí​shǒu meaning a thorny or troublesome problem

(bound form) thorns; any thorny or prickly plant; bushes with thorns

(bound form) the sour jujube tree; also known as 酸枣 suān​zǎo

(archaic) ancient long-handled weapon with blades; same as 戟 jǐ

a Chinese surname

(bound form) needle-like; spiny; used in terms like 棘皮动物 jí​pí​dòng​wù