お大事に[odaijini] take care of yourself
暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
伊勢大神宮[isedaijinguu] the Grand Shrines of Ise
伊勢大廟[isetaibyou] the Grand Shrines of Ise
偉大[idai] greatness

医科大学[ikadaigaku] medical school
医大[idai] medical university
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一大[ichidai] one large ...
一大事[ichidaiji] serious affair

篆書[tensho] characters used on seals
篆刻[tenkoku] seal engraving
篆字[tenji] seal script character

篆隷[tenrei] seal style and ancient square style
大篆[daiten] large seal script (dating from China's Spring and Autumn period onward)
小篆[shouten] small seal script (arising during China's Warring States period)