The halogens all form binary compounds with hydrogen, and these compounds are known as the hydrogen halides: hydrogen fluoride (HF), hydrogen chloride (HCl), hydrogen bromide (HBr), hydrogen iodide (HI), and hydrogen astatide (HAt).
finger stick. 1  the act of puncturing the tip of the finger to obtain a small sample of capillary blood. In some procedures the hand may be first immersed in warm water for 10 minutes to arterialize the capillary blood or give it characteristics similar to those of arterial blood.
clubbed finger one affected by clubbing. hammer finger mallet f. index finger forefinger. mallet finger partial permanent flexion of the terminal phalanx of a finger caused by a ball or other object striking the end or back of the finger, resulting in rupture of the attachment of the extensor tendon. Called also baseball or hammer finger. webbed f's syndactyly of the fingers.