bamboo
竺 centers on bamboo as a plant or material. It is a specific kanji for bamboo, often used in names or classical contexts.
竺 is composed of 竹 (bamboo) on top and 二 (two) below. The exact historical origin is uncertain; it may have originally depicted bamboo stalks or been a phonetic loan.
Two bamboo stalks (竹 on top, 二 below) standing together: 竺 is bamboo.
For ジク, imagine a thick bamboo stalk that you can jiggle: jiggle -> ジク, and the bamboo bends but doesn't break.
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India
guinea pig (any of five guinea pig species, esp. Cavia porcellus)
shiny guinea pig (Cavia fulgida)
Brazilian guinea pig (Cavia aperea)
montane guinea pig (Cavia tschudii)
China and India; far away
cotton sheeting
gagaku of Indian origin
wandering lordless samurai
dahlia (Dahlia pinnata)
Jersey stitch (knitware)
geranium (Pelargonium inquinans)
vertical-striped cardinalfish (Apogon lineatus); Indian perch; coral fish
Indian studies; Buddhist studies