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trombone
trombonist
trommel
tromp
trompe l’oeil
Tromsø
-tron
tron
trona
Trondheim
troop
troop carrier
trooper
troopie
troopship
troostite
trop-
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trona
tro·na [ trṓnə ]


noun 
Definition:
 
grayish-white or yellowish mineral: a grayish white or yellowish hydrated sodium carbonate mineral. Source: salt deposits.
[Late 18th century. < Swedish]
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