Sentence:  A practical application of this rule will admit an occasional small sound pin knot not over 1/8 inch in diameter; dark green or black spots or streaks not over 1/4 inch wide and 3 inches long or its equivalent; <WSD>birdeyes</WSD> and small burls; a slightly torn grain or similar defect which can be readily removed by the ordinary method of smoothing the floor when it is laid; 
Meaning of the word marked with <WSD> tags:  A small spot or knot in finished lumber.