[oh-pur-kyuh-luh m] /oʊˈpɜr kyə ləm/
noun, plural opercula
[oh-pur-kyuh-luh] /oʊˈpɜr kyə lə/ (Show IPA), operculums.
Botany, Zoology. a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
noun (pl) -la (-lə), -lums
(botany) the covering of the spore-bearing capsule of a moss
(biology) any other covering or lid in various organisms
1713, from Latin operculum “cover, lid,” from operire “to cover, close” (see weir), with instrumental suffix *-tlom. Related: Opercular.
operculum o·per·cu·lum (ō-pûr’kyə-ləm)
n. pl. o·per·cu·lums or o·per·cu·la (-lə)
o·per’cu·lar (-lər) adj.
Plural opercula or operculums
A lid or flap covering an opening, such as the gill cover in some fish or the horny flap covering the opening of a snail.
[oh-pe-re ki-tah-toh; English op-uh-ree sahy-tey-toh, si-tah-toh] /ˈoʊ pɛˌrɛ kɪˈtɑ toʊ; English ˈɒp əˌri saɪˈteɪ toʊ, sɪˈtɑ toʊ/ Latin. 1. .
[op-uh-ret-uh] /ˌɒp əˈrɛt ə/ noun 1. a short opera, usually of a light and amusing character. /ˌɒpəˈrɛtə/ noun 1. a type of comic or light-hearted opera n. “light opera,” 1775, from Italian operetta, diminutive of opera. Comic or lighthearted operas of the kind written by Gilbert and Sullivan. Operettas generally have a substantial amount of […]
[op-uh-ron] /ˈɒp əˌrɒn/ noun, Genetics. 1. a set of two or more adjacent cistrons whose transcription is under the coordinated control of a promoter, an operator, and a regulator gene. /ˈɒpəˌrɒn/ noun 1. (genetics) a group of adjacent genes in bacteria functioning as a unit, consisting of structural genes and an operator operon op·er·on (ŏp’ə-rŏn’) […]
[op-uh-rohs] /ˈɒp əˌroʊs/ adjective 1. industrious, as a person. 2. done with or involving much labor. /ˈɒpəˌrəʊs/ adjective (rare) 1. laborious 2. industrious; busy adj. “involving much labor,” 1670s, from Latin operosus “taking great pains, laborious, active, industrious,” from opus (genitive operis) “work” (see opus). Related: Operosity.