6 letters · 10 points in Scrabble
verb boil slowly at low temperature
noun temperature just below the boiling point
originFrom alteration of dialectal simper, from Middle English simperen (“to simmer”), of possibly imitative origin. First attested in the intransitive sense. The noun is from the verb. First attested in the late 15ᵗʰ century.
Etymology from Wiktionary, CC BY-SA 3.0