1. A reddish-brown chloride of heme; produced from haemoglobin in laboratory tests for the presence of blood
   "Forensic scientists use the hemin crystal test to detect blood at crime scenes";
   - protohemin

1. Surround in a restrictive manner
   "The building was hemmed in by flowers"
    
2. Encircle as a military tactic
   "The Turks hemmed in Vienna";
   - besiege, beleaguer, surround, circumvent, siege

Derived forms: hemming in, hems in, hemmed in, hemins

Type of: assail, attack, border, chloride, environ, ring, skirt, surround

Encyclopedia: Hemin