DICT.TW Dictionary Taiwan
3.145.77.232
Search for:
▼[Show options]
[Pronunciation] [Help] [Database Info] [Server Info]

1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Pho·to·he·li·om·e·ter n.   Astron. A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.
 ◄ ►