Guide  —n. 1 person who leads or shows the way. 2 person who conducts tours. 3 adviser. 4 directing principle. 5 book with essential information on a subject, esp. = *guidebook. 6 thing marking a position or guiding the eye. 7 bar etc. Directing the motion of something. 8 (guide) member of a girls' organization similar to the scouts. —v. (-ding) 1 act as guide to. 2 be the principle or motive of. [french from germanic]