A three-dimensional shape that resembles a half-sphere or hemisphere but may have slightly different mathematical proportions.
From hemisphere with the suffix '-oid' (meaning resembling or like), describing a shape that looks hemispherical but isn't perfectly mathematically symmetrical.
The '-oid' suffix is brilliant for science—it lets us name things that are almost but not quite the real deal: planetoids (almost planets), androids (almost humans), hemispheroids (almost hemispheres)!
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