annular
61annular drainage system — a drainage system arranged in a circular fashion around a central basin. See also dendritic, deranged, parallel and rectangular drainage systems …
62annular sclerite — annulus …
63annular lamina — (ARTHROPODA: Insecta) In Hymenoptera, the lamina or sternal plate situated in front of the genitalia of Formicidae …
64annular spiracle — (ARTHROPODA: Insecta) 1. In immature Lepidoptera and Hymenoptera, simple, ring like spiracles with a single opening with no accessory chambers. 2. In other immature insects, may be biforous, having two small or large accessory or secondary… …
65annular clock — a clock in the form of a vase, ball, etc., having the hours painted on a ring rotating beneath a pointer. * * * …
66annular eclipse — an eclipse of the sun in which a portion of its surface is visible as a ring surrounding the dark moon. Cf. total eclipse. [1720 30] * * * …
67annular gear — Mach. See internal gear. * * * …
68annular ligament — Anat. the ligamentous envelope surrounding a part, as the joints of the wrist or ankle or the head of the radius. [1835 45] * * * …
69annular eclipse — noun a solar eclipse in which the thin outer disk of the sun can be seen as a ring around the moon …
70annular zone — noun A ring of fibers on the stem of a mushroom that is not well enough defined to be called an annulus …