Someone who helps or facilitates; an assistant, a helper.
Something that enhances the effectiveness of a medical treatment; a supplementary treatment.
A substance enhancing the immune response to an antigen.
An additive (as in a drug) that aids or modifies the action of the principal ingredient.
An additive (often a separate product) that enhances the efficacy of pesticide products, but has little or no pesticidal activity itself.
Designating a supplementary form of treatment, especially a cancer therapy administered after removal of a primary tumour.
Helping; helpful; assisting.
Someone who guides, especially someone hired to show people around a place or an institution and offer information and explanation, or to lead them through dangerous terrain.
A grooved director for a probe or knife in surgery.
A sign that guides people; guidepost.
A blade or channel for directing the flow of water to the buckets in a water wheel.
A spirit believed to speak through a medium.
A member of a group marching in formation who sets the pattern of movement or alignment for the rest.
A document or book that offers information or instruction; guidebook.
Any marking or object that catches the eye to provide quick reference.
to serve as a guide for someone or something; to lead or direct in a way; to conduct in a course or path.
to act as a guide.
to exert control or influence over someone or something.
to supervise the education or training of someone.
to steer or navigate, especially a ship or as a pilot.