Astigmometer
an apparatus for measuring the degree of .
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- Astigmatoscope
an instrument for determining the presence and severity of . astigmatoscope as·tig·mat·o·scope (ās’tĭg-māt’ə-skōp’) or a·stig·mo·scope (ə-stĭg’mə-skōp’) n. an instrument for detecting and measuring the degree of astigmatism. a·stig’ma·tos’co·py (-tŏs’kə-pē) or as’tig·mos’co·py (-mŏs’kə-pē) n.
- Astigmatoscopy
examination by means of an astigmatoscope.
- Astigmia
also called astigmia [uh-stig-mee-uh] /əˈstɪg mi ə/ (show ipa). ophthalmology. a refractive error of the eye in which parallel rays of light from an external source do not converge on a single focal point on the retina. optics. an aberration of a lens or other optical system in which the image of a point is […]
- Astilbe
any plant of the genus astilbe, of the saxifrage family, having spirelike cl-sters of small white, pink, or reddish flowers. noun any perennial saxifragaceous plant of the genus astilbe of e asia and north america: cultivated for their ornamental spikes or panicles of pink or white flowers
- Astir
moving or , especially with much activity or excitement: the field was astir with small animals, birds, and insects. up and about; out of bed. historical examples but, then, it was so early that not many even of the early-rising farmers were astir. ruth fielding in the red cross alice b. emerson the child was […]