pa
n 1: an informal term for a father; probably derived from baby
talk [syn: {dad}, {dada}, {daddy}, {old man}, {papa}, {pappa},
{pater}, {pop}]
2: a short-lived radioactive metallic element formed from
uranium and disintegrating into actinium and then into
lead [syn: {protactinium}, {protoactinium}, {Pa}, {atomic
number 91}]
3: a unit of pressure equal to one newton per square meter
[syn: {pascal}, {Pa}]
4: an electronic amplification system used for communication in
public areas [syn: {public address system}, {PA system}, {PA}]