(botany) A plant that turns so that it faces the sun. / (botany) Particularly, a purple-flowered plant of the species Heliotropium arborescens. / A light purple or violet colour.

Light purple or violet. / Keeping one’s face turned toward the sun.

An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight. / A heliogram. / An instrument for measuring the intensity of sunlight. / A device for photographing the sun.

(transitive) To send a message by heliograph. / (intransitive) To send a heliograph. / (transitive, dated) To photograph by sunlight.

(nautical, intransitive, said of a ship) To respond to a movement of the helm by changing direction; only happens if the ship has steerageway.

(basketball) A situation in which players of opposing teams both hold the ball, with neither clearly possessing it outright.

In the shape of a helix.

Used other than figuratively or idiomatically: see cry, for, help. / (idiomatic) Acting out as a means of displaying a subconscious desire for attention or help.

A continuing state of extreme pain, punishment, suffering, or torment with no seeming chance of reprieve.

(astronomy, history) The theory that the sun is the center of the universe. / (informal) The phenomenon of the Earth revolving around the Sun.