stri·a (str???)n. pl. stri·ae (str???) 1. A thin, narrow groove or channel.2. A thin line or band, especially one of several that are parallel or close together: a characteristic stria of contractile tissue.[Latin; see streig- in Indo-European roots.]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.stria (?stra??) n (often plural) , pl striae (?stra?i?) 1. (Geological Science) geology Also called: striation any of the parallel scratches or grooves on the surface of a rock caused by abrasion resulting from the passage of a glacier, motion on a fault surface, etc2. (Geological Science) fine ridges and grooves on the surface of a crystal caused by irregular growth3. (Biology) biology anatomy a narrow band of colour or a ridge, groove, or similar linear mark, usually occurring in a parallel series4. (Anatomy) biology anatomy a narrow band of colour or a ridge, groove, or similar linear mark, usually occurring in a parallel series5. (Architecture) architect a narrow channel, such as a flute on the shaft of a column[C16: from Latin: a groove]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014stri?a (?stra? ?) n., pl. stri?ae (?stra? i) 1. a slight or narrow furrow, ridge, stripe, or streak, esp. one of a number in parallel arrangement: striae of muscle fiber. 2. any of a series of parallel lines on glaciated rock surfaces or the faces of crystals. [1555?65;