Requiring a high level of effort or performance.

(pharmacology) An antithrombotic agent binding to the GPIbα subunit of the glycoprotein Ib-IX-V complex, purified from the venom of the sharp-nosed viper (Deinagkistrodon acutus).

A complete set of institutions, political organizations, interest groups (such as political parties, trade unions, lobby groups), the relationships between those institutions and the political norm...

Initialism of nuclear hydrogen detection meter.