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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Thermal units.:

CALORIE: Thermal unit.
CALORIE: Thermal unit: Physics.
CALORY: Thermal unit.
BTUS: Thermal units.
BTU: Thermal unit: Abbr.
ERG: Tiny fraction of a British thermal unit