pappus

pap·pus

P0053700 (păp′əs)n. pl. pap·pi (păp′ī) A modified calyx, composed of scales, bristles, or featherlike hairs, in plants of the composite family, such as the dandelion and the thistle.

[Latin, old man, down on certain seeds, from Greek pappos; see papa in Indo-European roots.]

pap′pose (-ōs) adj.

pappus

(ˈpæpəs) n, pl pappi (ˈpæpaɪ) (Botany) a ring of fine feathery hairs surrounding the fruit in composite plants, such as the thistle; aids dispersal of the fruits by the wind[C18: via New Latin, from Greek pappos grandfather, old man, old man's beard, hence: pappus, down] ˈpappose, ˈpappous adj

pap•pus

(ˈpæp əs)

n., pl. pap•pi (ˈpæp aɪ) a downy, bristly, or other tuftlike appendage of the achene of certain plants, as the dandelion and thistle. [1695–1705; < New Latin < Greek páppos down, literally, grandfather (taken as greybeard, white hairs, down)] pap′pose (-oʊs) adj. pap′pous (-əs) adj.

Thesaurus

Noun

pappus - calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelionscalyx - (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually greenthistledown - pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle

Pappus

(păp`əs), fl. c.300, Greek mathematician of Alexandria. He recorded and enlarged on the results of his predecessors, including Euclid and Apollonius of Perga, in his Mathematical Collection (8 books; date conjectural). The six and a half extant books, edited and translated into Latin by Commandinus (1588), stimulated a revival of geometry in the 17th cent.; Descartes expounded several of his problems. The collection was reedited by Frederick Hultsch (1876–78). Pappus' other works include a commentary on Ptolemy's Almagest.

Bibliography

See T. L. Heath, A Manual of Greek Mathematics (1931).

Pappus

a winglike growth or very large trichome on the fruits and seeds of many plants. The pappus assists in the spreading of the fruits and seeds by the wind.

Pappus

(Pappus of Alexandria). Years of birth and death unknown. Greek mathematician of the second half of the third century.

Pappus was the author of Mathematical Collections in eight books, only the last six of which are extant. The first two books were devoted to arithmetic, and the third through fifth books deal primarily with geometry. The sixth is on astronomy, the seventh contains a commentary on the works of Apollonius of Perga, including the latter’s Conic Sections, and the eighth deals with mechanics. Pappus’ work, a compendium of many works that have since been lost, is a valuable source for the history of Hellenistic mathematics.

WORKS

Pappi Alexandrini collectionis quae supersunt, vols. 1–3. Edited by F. Hultsch. Berlin, 1876–78.

REFERENCES

Heiberg, J. L. Estestvoznanie i matematika v klassicheskoi drevnosti. Moscow-Leningrad, 1936. (Translated from German.)
Sarton, G. A. A History of Science. Cambridge, Mass., 1952.

Pappus

the aggregate of hairs or scales in a ring of one, two, or more rows on the apex of the inferior ovary and fruit of most plants of the families Compositae, Valerianaceae, and some others. The pappus helps in the distribution of seeds and fruits by means of wind, water, and animals.

pappus

[′pap·əs] (botany) An appendage or group of appendages consisting of a modified perianth on the ovary or fruit of various seed plants; adapted to dispersal by wind and other means.

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Words related to pappus

noun calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions

Related Words