heliometer

From helio- +‎ -meter, from Ancient Greek Ἥλιος (Hḗlios), from ἥλιος (hḗlios, “sun”), and French mètre, from Ancient Greek μέτρον (métron, “measure”).

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heliometer (plural heliometers)

1. An astronomical instrument, based on a telescope, for measuring the diameter of the sun; now used to measure the angular distance between stars and other celestial bodies.

• heliometric
• heliometry

Probably borrowed. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

• IPA^(key): /ˈɦeː.li.oːˌmeː.tər/
• Hyphenation: he‧lio‧me‧ter

heliometer m (plural heliometers, no diminutive)

1. heliometer

   Synonym: helioscoop

• IPA^(key): /ɦeliɔmeter/, [ˈɦeliɔmeter]
• Rhymes: -eter
• Hyphenation: he‧li‧o‧me‧ter

heliometer m inan

1. heliometer

• “heliometer”, in Slovníkový portál Jazykovedného ústavu Ľ. Štúra SAV [Dictionary portal of the Ľ. Štúr Institute of Linguistics, Slovak Academy of Science] (in Slovak), https://slovnik.juls.savba.sk, 2003–2026