planetesimal

Meanings

Plural: planetesimals

Noun

• one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system
• Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.

Adj

• Being or relating to one of these astronomical objects.

Related Words

asteroid, dwarf planet, major planet, mesoplanet, minor planet, planemo, planet, planetoid, protoplanet, superplanet