Where does “underfilter” come from?
underfilter (English) comes from English filter, from German filter, from French filtré, from Medieval Latin filtrum, from Frankish filtir, from Frankish *felt, from Proto-Germanic *felt, from Proto-Indo-European peld- — to cover, to wrap; skin, hide, cloth; to fold.
underfilter (English): A morphological filter (idempotent operator) whose image is a subset of the domain
Definitions
- A morphological filter (idempotent operator) whose image is a subset of the domain
Ancestry of “underfilter”, step by step
underfilter traces back through two separate lines of ancestry.
via English filter
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | English | filter | A device which separates a suspended, dissolved,... |
| 2 | German | filter | inflection of filtern: ## first-person singular... |
| 3 | French | filtré | past participle of filtrer; filtered |
| 4 | Medieval Latin | filtrum | felt |
| 5 | Frankish | filtir | — |
| 6 | Frankish | *felt | — |
| 7 | Proto-Germanic | *felt | — |
| 8 | Proto-Indo-European | peld- | something beaten or compressed; felt |
| 9 | Proto-Indo-European | pelh₂- | to approach |
| 10 | Proto-Indo-European | pel- | to cover, to wrap; skin, hide, cloth; to fold |