| ACh | any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads |
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| ACh | ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets |
| ACh | Eurasian herb having loose heads of button-shaped white flowers and long gray-green leaves that cause sneezing when powdered |
| ACh | a mythical Greek hero of Homer's Iliad |
| ACh | a large tendon that runs from the heel to the calf |
| ACh | a seemingly small but actual mortal weakness |
| ACh | any plant of the genus Achimenes having showy bell-shaped flowers that resemble gloxinias |
| ACh | a dull persistent (usually moderately intense) pain |
| ACh | causing a dull and steady pain |
| ACh | canna grown especially for its edible rootstock from which arrowroot starch is obtained |
| ACh | (botany) not having a floral envelope or perianth |
| ACh | an abnormal deficiency or absence of free hydrochloric acid in the gastric juice |