Initialism of parent-teacher association.

Initialism of prepaid ticket advice: information sent to an airline that a passenger will collect the ticket at the airport (not the same as an e-ticket).

plural of PTA

Any of three species of small grouse in the genus Lagopus found in subarctic tundra areas of North America and Eurasia.

A substance, such as pepper or snuff, that causes sneezing.

Relating to a substance that causes sneezing.

(organic chemistry) A carcinogenic terpenoid glycoside, found in bracken, that is poisonous to cattle.

plural of ptarmic

plural of ptarmigan

(Egyptian mythology) A god of creativity and craftsmen, sometimes also identified with gods of death and the birth of the sun.