hex-

Century Dictionary and Cyclopedia

1. n. In chem., in compound words, signifying the presence of six atoms of an element or six molecules of a compound.

Wiktionary

1. form of hexa- used before a vowel.

GNU Webster's 1913

1. A prefix or combining form, used to denote six, sixth, etc..

WordNet 3.0

1. n. an evil spell
2. v. cast a spell over someone or something; put a hex on someone or something
3. adj. of or pertaining to a number system having 16 as its base