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A small opening or pore, as of a fruiting body.

[Latin ōstiolum, diminutive of ōstium, opening; see ostium.]

os′ti·o′lar (ŏs′tē-ō′lər, ŏ-stī′ə-) adj.


1. (Botany) the pore in the reproductive bodies of certain algae and fungi through which spores pass
2. (Biology) any small pore
[C19: from Latin ostiolum, diminutive of ostium door]
ostiolar, ˈostioˌlate adj


(ˈɒs tiˌoʊl)

an opening or pore.
[1825–35; < Latin ōstiolum little door, diminutive of ōstium door]
os•ti•o•lar (ˈɒs ti ə lər, ɒˈstaɪ-) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ostiole - a small pore especially one in the reproductive bodies of certain algae and fungi through which spores pass
pore - any small opening in the skin or outer surface of an animal
References in periodicals archive ?
Peritecios de 270-450 x (160-)240-270 [micro]m, globosos, piriformes a ovoides, no estromaticos, de color anaranjado, anaranjado rojizo o rojo, no se colapsan cuando secos, con un disco ostiolar plano no papilado, ligeramente mas oscuro que las paredes periteciales, ornamentado con prominentes verrugas conicas, de amarillentas a anaranjado rojizas, de hasta 150-180 [micro]m de alto; estructura de las paredes periteciales no observada, por la dificultad de hacer cortes a navaja por los peritecios muy pequenos y solitarios; solo se observo la estructura de las escamas o verrugas que presentan celulas de hasta 100 [micro]m de largo, perpendiculares a la pared de las celulas periteciales; ascas 60-85 x 12-25 [micro]m, biseriadas, clavadas; ascosporas (16-)19-23 x 7-9.
There was a relationship between the presence of two mandibular appendages of extant female morphotype of Hexapus and the ostiolar conformation of the five hosting fig species studied.
15); dorsal abdominal scent glands on abdominal segments 4-5 and 5-6 with rounded ostioles, bearing closing cuticular valve, ostiolar peritreme spout shaped (Fig.
Propleura finely punctate, side of mesosternum finely punctate, but weakly rugose at middle; ostiolar evaporative area with a large, distinct auricle.
Ventral surface: Pale brown, ostiolar peritreme creamy white, abdominal venter bearing short, recumbent, pale, simple setae, these setae longer and more numerous on lateral margins of genital cavity.