An allumette t is a matchstick-sized cut, 6 mm x 6 mm x 5 to 6 cm (1/4 in. x 1/4 in. x 2 to 2½ in.) long, used for potatoes and other firm vegetables. Allumette also refers to puff pastry cut into sticks. ...
• (n.) A match for lighting candles, lamps, etc.
Potatoes, cut into pieces the size and shape of matchsticks, 1/8 inch x 1/8 inch x 1 to 2 inches
Al`lu`mette noun [ French, from allumer to light.] A match for lighting candles, lamps, etc. 
match; puff pastry strips; also fried matchstick potatoes.