第
ダイ, テイ

No., residence

JLPT1 G3 S11 F160

An abbreviated form# of 弟 (vertical alignment) + 竹 bamboo → neatly stacked pieces of bamboo (compare the bamboo counting sticks in 算) → *ordinal number*; *prefix*; *grade*; *degree* (← stacking).

[Full Kanji Etymology List]