7 letters · 7 points in Scrabble
adjective relating to symptoms (especially malarial fever) that appear every other day
adjective of or relating to a tonal system based on major thirds
originFrom Middle English tertiān, terciān, terciāne (adjective and noun), originally often as part of the collocation fever cum terciane, after Latin febris cum tertiānā. Compare the "third" essence of tertiary. By surface analysis, terti- + -an.
Etymology from Wiktionary, CC BY-SA 3.0