A – APERIODIC
B - BACTERIA
C - CINDER CONE   
D - DORSUM
E - EMBRYONIC STEM CELL   
F - FRESHWATER
G - GPRS
H - HOT SPOTS   
I - INTERPLANETARY MAGNETIC FIELD   
J - JEJUNUM 
K - KARYOKINESIS
L - LABES 
M - METEOR
N - NON-RENEWABLE RESOURCE   
O - OVERBURDEN   
P - PERIPHERAL
Q - QUALITATIVE 
R - RADIAN
S - SPECTRUM
T - TROPHIC LEVEL   
U - UTERUS   
v - VISCERA   
W - WALKER CIRCULATION   
X - X- BAND   
Y - Y-CHROMOSOME   
Z - Z-DNA