(mathematics, in two dimensions) Describing a double spiral that starts at the origin and divides the plane into two

(mathematics, in two dimensions) Describing a multiple spiral that starts at the origin and divides the plane into multiple regions

A fast or quick start, as to a race.

plural of start codon

(astronautics) An explosion in a rocket engine during startup, usually due to the presence of too much propellant prior to ignition.

(idiomatic) To be extremely visible and obvious to someone.

(intransitive) To rise suddenly. / (transitive, intransitive) To begin to operate. / (intransitive, colloquial) To begin.

present participle of stargaze

The act of gazing at the stars; astronomy.

present participle of start up