h 4 e 1 l 1 i 1 a 1 c 3
6 letters · 11 points in Scrabble
Meaning
adjective pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun
originShort for helical accelerator.
Etymology from Wiktionary, CC BY-SA 3.0