In this article. A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.
The name Mu is of Chinese origin. The meaning of Mu is wood. Mu is used as both a boys and girls name. It consists of 2 letters and 1 syllable and is pronounced Mu.
Noun. 1. mu-the 12th letter of the Greek alphabet. Greek alphabet-the alphabet used by ancient Greeks. alphabetic character, letter of the alphabet, letter-the conventional characters of the alphabet used to represent speech; his grandmother taught him his letters. 1  Facebook.