壽
ジュ, ス, シュウ, ことぶき, ことぶ.く, ことほ.ぐ, かず, じ, とし, ひさ, ひさし

longevity, congratulations

JLPT0 G13 S0 F5000

The relevant seal inscription form is an abbreviated form# of 老 (aged person) + ridges surrounding a paddy or field → aged person following a long, curved ridge about a paddy/field → *longevity*; *long span* (← length of an aged person's lifespan) → *congratulations* (← celebration of long life).

[Full Kanji Etymology List]