(rugby) player who introduces the ball into a scrum.

(rugby) A rugby player who is normally the first receiver of the ball from the scrum half after a scrum; a half-back.

Alternative spelling of half-baked

(idiomatic) All over the place; everywhere.

producing hallucinations

a substance that is a hallucinogen.

(chemistry) Either the oxidation or the reduction component of a redox reaction

Any substance tending to induce hallucination.

(transitive and intransitive) To seem to perceive things (with one or more of one's senses) which are not really present; to have visions; to experience a hallucination.

(games) A strategic board game played with counters on a board of 16×16 squares.