A.E.T.

aet. or aetat.,

at the age of (usually at death); aged (a designated figure); »

Here lies John Richards, aet. 71.

Also, ae.

╂[abbreviation of Latin aetātis, genitive of aetās age]

AET (no periods) or A.E.T.,

a crystalline chemical compound used in the prevention and treatment of radiation sickness. Formula: C₃H₁₁Br₃N₃S

╂[< A(mino) E(thyl) (iso)T(hiouronium)]