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A white solid oligomer of formaldehyde, (CH2O)n, where n is at least 6, used as a disinfectant, fumigant, and fungicide.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌpærəfɔːˈmældɪˌhaɪd) or


(Elements & Compounds) a white amorphous solid polymeric form of formaldehyde: used as a convenient source of formaldehyde and as a fumigant. Formula: (CH2O)n, where n lies between 6 and 50
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌpær ə fɔrˈmæl dəˌhaɪd, -fər-)

a white, crystalline polymer of formaldehyde, (HCOH)n, used chiefly as an antiseptic. Also called par′a•form` (-ˌfɔrm)
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
samples inactivation inactivation ([dagger]) ([dagger]) 7,3 +/+ ([double +/+ dagger]) 14, 3 -/- +/+ 21, 3 -/- +/+ * Infected skin tissues from 3 guinea pigs were fixed for 7, 14, or 21 d in 4% paraformaldehyde, rinsed for 30 min in phosphate-buffered saline, and then homogenized.
The mononuclear cells were obtained from the pancreas and other tissues; the cells were procured in PBS, washed, subjected to red blood cell lysis, and suspended in PBS containing 1% paraformaldehyde for analysis of fluorescence intensity using flow cytometry.
Cells were fixed with 4% paraformaldehyde for 20 min, rendered permeable with 0.5% Triton X-100 (Sigma-Aldrich) for 20 min and blocked with rabbit serum (Boster Bioscience) for 30 min at room temperature.
In a three-necked round-bottomed flask equipped with a magnetic stirrer and a reflux condenser, paraformaldehyde (1.8 g, 0.06 mol) and DMSO (20 mL) were taken and stirred at 50[degrees]C.
In breif, after pGH injections, the porcine hepatocytes were rapdliy isolated and fixed with 4% paraformaldehyde for 20 min, then permeabilized for 5 min in 0.5% Triton X-100.
The pellets were then immunostained as follows: following fixation of the pellets with 4% paraformaldehyde phosphate-buffered solution for 15 min at 4[degrees]C, cells were permeabilized with 0.1% Triton X-100, washed with PBS containing 2% BSA, and incubated with primary antibodies diluted in PBS containing 2% BSA.
After the endoscopy procedure, collected intestinal tissues were fixed with 4% paraformaldehyde solution, embedded in paraffin block, and sectioned using a microtome.
It can take the form of formalin, a parapaste ingredient, or paraformaldehyde. As a xenobiotic, it has impact on the immune system even at low concentration levels.
The right kidneys of fetuses were removed and fixed with 4% paraformaldehyde and made into paraffin block.
Cells were preincubated for 10 min in Phosphate-Buffered Saline (PBS) and then fixed for 20 min with 4% paraformaldehyde in PBS at room temperature.
Following incubation, the invaded cells attached to the lower surface of the membrane were fixed using 4% paraformaldehyde and stained with 1% toluidine blue.
Cells seeded on sterile coverslips in 24-well plates were fixed in 4% paraformaldehyde at 4[degrees]C for 30 min.