"striation" in the noun sense
1. stria, striation
any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue
2. band, banding, stria, striation
a stripe or stripes of contrasting color
"chromosomes exhibit characteristic bands"
"the black and yellow banding of bees and wasps"
Source: WordNet® (An amazing lexical database of English)
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