| puccoon | <botany> Any one of several plants yielding a red pigment which is used by the North American Indians, as the bloodroot and two species of Lithospermum (L. Hirtum, and L. Canescens); also, the pigment itself. Origin: From the American Indian name. Source: Websters Dictionary (01 Mar 1998) |
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| puceron | <zoology> Any plant louse, or aphis. Origin: F, from puce a flea. See: Puce. Source: Websters Dictionary (01 Mar 1998) |
| pucherite | <chemical> Vanadate of bismuth, occurring in minute reddish brown crystals. Origin: So named from the Pucher Mine, in Saxony. Source: Websters Dictionary (01 Mar 1998) |
| Puchtler-Sweat stain | <technique> For basement membranes, a staining method using resorcin-fuchsin and nuclear fast red solutions after Carnoy's fixative; basement membranes are gray to black and nuclei pink to red. For haemoglobin and haemosiderin, a complex staining method in which, on a yellow background, haemoglobin is stained red, haemosiderin blue to green and elastic fibres are pink. (05 Mar 2000) |
| Puchtler-Sweat stains | See: Puchtler-Sweat stain for basement membranes, Puchtler-Sweat stain for haemoglobin and haemosiderin. (05 Mar 2000) |
| puck | 1. <medicine> A celebrated fairy, "the merry wanderer of the night;" called also Robin Goodfellow, Friar Rush, Pug, etc. "He meeteth Puck, whom most men call Hobgoblin, and on him doth fall." (Drayton) 2. <zoology> The goatsucker. Origin: OE. Pouke; cf. OSw. Puke, Icel. Puki an evil demon, W. Pwca a hobgoblin. Cf. Poker a bugbear, Pug. Source: Websters Dictionary (01 Mar 1998) |
| pucker | To gather into small folds or wrinkles; to contract into ridges and furrows; to corrugate; often with up; as, to pucker up the mouth. "His skin [was] puckered up in wrinkles." Origin: From Poke a pocket, small bag. Source: Websters Dictionary (01 Mar 1998) |
| pucras | <zoology> See Koklass. Origin: From a native name in India. Source: Websters Dictionary (01 Mar 1998) |