bottom roller
one of the steel balls or rubber disks, about 41 to 61 cm in diameter, mounted on the bottom of a trawl

Dictionary of ichthyology. 2009.

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  • roller skate — roller ,skate noun count a boot with four small wheels on the bottom used for moving quickly along, especially for fun or as a sport ╾ roller ,skate verb intransitive ╾ roller ,skating noun uncount …   Usage of the words and phrases in modern English

  • roller skate — I noun a shoe with pairs of rollers fixed to the sole (Freq. 1) • Hypernyms: ↑skate • Part Meronyms: ↑roller II verb travel on shoes with steel or rubber rollers attached to their soles …   Useful english dictionary

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  • roller-skating — Recreation and sport in which the participants use roller skates (shoes with sets of wheels attached) to move about on special rinks or paved surfaces. The invention of roller skates is traditionally credited to the Belgian Joseph Merlin in the… …   Universalium

  • roller skate — UK / US noun [countable] Word forms roller skate : singular roller skate plural roller skates a boot with four small wheels on the bottom used for moving quickly along, especially for fun or as a sport Derived words: roller skate UK / US verb… …   English dictionary

  • Roller racer — A Roller Racer is a human powered vehicle and children s toy.cite web publisher = The Experimental Nonlinear Physics Group, Dept of Physics, University of Toronto title = The Physics of the Roller Racer and the Plasma Car date = 2008 url =… …   Wikipedia

  • roller skate — shoe with wheel on the bottom used for skating; skate on roller skates …   English contemporary dictionary

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