Also found in: Medical, Encyclopedia, Wikipedia.


 (hŏl′ə-blăs′tĭk, hō′lə-)
adj. Embryology
Exhibiting cleavage in which the entire egg separates into individual blastomeres.

hol′o·blas′ti·cal·ly adv.


(Physiology) embryol of or showing cleavage of the entire zygote into blastomeres, as in eggs with little yolk. Compare meroblastic
ˌholoˈblastically adv


(ˌhɒl əˈblæs tɪk, ˌhoʊ lə-)

undergoing total cleavage in which the whole egg separates into equal blastomeres.
[1870–75; holoblast (holo- + -blast) + -ic]
ho`lo•blas′ti•cal•ly, adv.
References in periodicals archive ?
The patterns of early cleavage can be holoblastic or incomplete (Weygoldt, 1961: Anderson, 1973; Scholtz and Wolff, 2013; Wolff and Gerberding, 2015).
It is distinguished by a thick-walled and branched conidiogenous system, and holoblastic, flabelliform to palmate, and distoseptate conidia (Hawksworth and Poelt, 1986, 1990; Sutton and Muhr, 1986; Tonsberg, 2002).
Most of the chapters focus on types of molds: those with arthrospores, with aleuriospores, with holoblastic conidia, with enteroblastic conidia, mucoraceous molds, and miscellaneous molds.
Holoblastic cleavage is practiced in each of the approximately 31 phyla.
Cleavage is spiral, equal, and holoblastic, as is typical of nemerteans.
Opisthobranch embryology involves spiral, typically holoblastic, cleavage, which is highly conserved within annelids, molluscs, and nemerteans (Wilson, 1892; Casteel, 1904; Thompson, 1958; Maslakova et al., 2004a, b; Nielson, 2004).