A starlike human body esp one of the numerous small planets whose orbits lie between those of Mars and Jupiter called also planetoids and minor planets
- formed like a star
- any one of many tiny celestial bodies made up of stone and metal that move around the sun (mainly amongst the orbits of Mars and Jupiter)
- A starlike human body; esp. other possible small planets whose orbits lie between those of Mars and Jupiter; -- called in addition planetoids and minor planets.
1802, coined probably by German-born English astronomer William Herschel (1738-1822) from Greek asteroeides "star-like," from aster "star" (see astro-) + -eidos "form, form" (see -oid).
(letter.) A starlike body; esp. among the numerous small planets whose orbits lie between those of Mars and Jupiter; -- labeled as in addition planetoids and minor planets.
The position of the pores near the centre of the ambulacrals in Bothriocidaris need not be regarded as primitive, since other early Palaeozoic genera, not to mention the young of living forms, show that the podia originally passed out between the plates, and were only gradually surrounded by their substance; thus the original structure of the echinoid ambulacra differed from that of the early asteroid in the position of the radial vessels and nerves, which here lie beneath the plates instead of outside them.