aculeus – מילון אנגלי-עברי
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Butterfly Cluster
The
Butterfly Cluster (cataloged as
Messier 6 or
M6, and as
NGC 6405) is an
open cluster of
stars in the constellation of
Scorpius. Its name derives from the vague resemblance of its shape to a
butterfly.
Butterfly cluster compound
In the area of
metal cluster chemistry, a
butterfly cluster compound usually describes tetrametallic clusters containing five M-M bonds. A prototype of this motif is [Re
4(CO)
12]
2-. Most butterfly clusters have additional
bridging ligands. One inexample is the tetra
phosphide Rh<sub>4</sub>(CO)<sub>5</sub>(PPh<sub>2</sub>)<sub>5</sub>
-. A carbide-containing butterfly cluster is [Fe
4C(CO)
12]
2-.
aculeus
Noun
1. a stiff sharp-pointed plant process
(hypernym) plant process, enation
(hyponym) spine, thorn, prickle, pricker, sticker
2. a sharp-pointed process especially a sting of a hymenopterous insect
(hypernym) stinger
Aculeus
(n.)
A sting.
(n.)
A prickle growing on the bark, as in some brambles and roses.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
aculeus
N M
sting| spine| thorn| prickle| point| spike; barb; pang| prick; sarcasm
aculeus
