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Any of the four haploid cells that are formed by meiosis from a spermatocyte and that develop into spermatozoa without further division.
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.


(Zoology) zoology any of four immature male gametes that are formed from a spermatocyte, each of which develops into a spermatozoon
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈspɜr mə tɪd)

one of the cells that result from the meiotic divisions of a spermatocyte and that mature into spermatozoa.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.spermatid - an immature gamete produced by a spermatocyte; develops into a spermatozoon
gamete - a mature sexual reproductive cell having a single set of unpaired chromosomes
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Control group Table 3: The number of different testis cell types (x[10.sup.6]) Groups Spermatogonia A Spermatogonia B Sertoli cell Control 0.83[+ or -]0.06 0.16[+ or -]0.07 2.7[+ or -]0.2 BD1/2 0.83[+ or -]0.05 0.13[+ or -]0.05 2.5[+ or -]0.1 BD1/4 0.84[+ or -]0.05 0.18[+ or -]0.05 2.7[+ or -]0.3 Groups Primary Round Long spermatocyte spermatid spermatid Control 12.1[+ or -]0.98 31.8[+ or -]2.49 30.9[+ or -]3.02 BD1/2 12.0[+ or -]0.80 31.0[+ or -]2.18 30.6[+ or -]2.66 BD1/4 12.4[+ or -]0.92 32.2[+ or -]2.20 32.1[+ or -]2.65 Groups Leydig cell Control 2.2[+ or -]0.02 BD1/2 2.5[+ or -]0.15 (**) BD1/4 2.1[+ or -]0.03 The values (n=5) are presented as mean[+ or -]SD.
Prolonged dosing resulted in continued spermatocyte degeneration as well as maturation depletion of the spermatid population, leaving tubules containing only sustentacular cells, spermatogonia and preleptotene spermatocytes.
The Johnsen score (13) Score Level of spermatogenesis 1 No seminiferous epithelial cells, tubular sclerosis 2 No germ cells, Sertoli cells only 3 Spermatogonia only 4 Few spermatocytes, arrest of spermatogenesis at the primary spermatocyte stage 5 Many spermatocytes 6 Few early spermatids, arrest of spermatogenesis at the spermatid stage 7 No late spermatids, many early spermatids 8 Less than five spermatozoa per tubule 9 Slightly impaired spermatogenesis 10 Full spermatogenesis Table 2.
In the evaluation of the spermatogenesis stages, 100 sections of the seminiferous tubules of animals' testis in puberty and sexual maturity, were classified into stages of I-VI (presence of two generations of spermatids), VII-VIII (mature spermatids present in lumen), IV-XII (presence of a spermatid generation) XIV (presence of secondary spermatocytes) (Ferreira, Lison, & Valeri, 1967).
Male germ cells used in this study derived from two time points during development: pachytene spermatocyte (PS) acquired during prophase of meiosis I, and round spermatid (RS) acquired after completing meiosis.
One important stage in spermatogenesis is the meiotic division that occurs when the primary spermatocyte develops into spermatid. Meiosis is the process of cell division through double cleavage and the reduction of the number of chromosomes.
PSC = primary spermatocyte; SSC = secondary spermatocyte; ST = spermatid; SPZ = spermatozoa; SZ = spermatozeugmata.
Nucleus of Sertoli cells and germ cells (spermatogonia type A, pachytene primary spermatocyte and round spermatid) were counted in 20 seminiferous tubules per rat (n = 10 animals [group.sup.-1]) at stage VII of spermatogenesis, under a light microscope (Leica DMLS), at x 400 magnification.
FW, follicular wall; Lu, lumen; Ct, connective tissue; MS, mature spermatozoa; St, spermatid; Spz, spermatozoa; DSz, degenerative spermatozoon.