Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


(nʊˈmæt əˌfɔr, -ˌfoʊr, nyʊ-)

1. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
2. the air sac of a siphonophore, serving as a float.
pneu•ma•toph•or•ous (ˌnu məˈtɒf ər əs, ˌnyu-) adj.
Mentioned in ?
References in periodicals archive ?
The intercalary meristem is situated at the basal portion of the blade, near the junction with the pneumatocyst, and new tissues are constantly moved along the longitudinal axis of the blade (Hoek et al.
Incidentally, a well-defined lytic lesion was seen in the sacrum adjacent to the left sacroiliac joint consistent with a pneumatocyst.