planetesimal planeted • planeticose · · · Info · Definitions · Characters · · planetesimal · · Text Latin · · Script 12 · · Length Definitions · · · (noun) one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system. · · Noun Definition 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074