(Internet slang) Initialism of I pissed myself laughing: used to indicate great amusement, usually exaggerated.

The long-tailed pangolin (Manis tetradactyla)

(climate change, UN) Initialism of Intergovernmental Panel on Climate Change (a scientific body under the auspices of the United Nations.)

(technology, project management) Initialism of International Project Management Association.

(ichthyology) Any fish in the family Ipnopidae, the deepsea tripod fish.

plural of ipnopid

(pharmacology) An anticholinergic drug.

(pharmacology) A growth hormone–releasing hormone analogue.

A neuroprotective drug that is a glutamate antagonist.

An antiarrhythmic drug.