Hobnail

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Referring to a 2-dimensional (when seen on glass slides of imaging) or 3-dimensional jutting of mutiple large rounded masses above a flattened surface
References in periodicals archive ?
And as he walked across the churchyard towards the pub he heard Jack's hobnails retreating slowly and deliberately towards the old library.
Sir Humphry said: "He is a high professional going up in fantastic conditions and well done him but it covers up the amazement of these people going up in hobnails and their tweed.
He has built a reputation as a thug and insensitive loudmouth who revels in picking a fight with his own side and can't see a problem without stamping all over it with his size-12 hobnails.
An account of hobnails for shoes called "little gallics".
That eternal grump, Bobby's brother Jack, also donned the hobnails.