guide

Concise Oxford English Dictionary © 2008 Oxford University Press:
guide/ɡʌɪd/

▶noun

• 1 a person who advises or shows the way to others.

  ■ a professional mountain climber in charge of a group.

• 2 a directing principle or standard.

  ■ a book providing information on a subject.

• 3 a structure or marking which directs the motion or positioning of something.

• 4 (Guide) chiefly Brit. a member of the Guides Association, a girls' organization corresponding to the Scouts.

▶verb

• 1 show or indicate the way to.

• 2 direct the motion or positioning of.

  ■ (as adj. guided) directed by remote control or internal equipment: a guided missile.

• 3 direct or influence the behaviour of.

– derivatives
guidable adjective,
guider noun.

– origin ME: from OFr. guide (n.), guider (v.), of Gmc origin; rel. to wit2.