English

hypoelliptic

From hypo- + elliptic.

Proto-Indo-European *upó ‘under, below’

Ancient Greek ὑπό ‘under’

English hypo-

Proto-Indo-European *leykʷ- ‘to leave behind’

Ancient Greek λείπω ‘to leave’

Ancient Greek ἐλλείπω ‘I leave out, omit’

Ancient Greek ἐλλειπτικός ‘defective’

Today it means

adj Related to or involving hypoelliptic operators.

Language periods are conventional ranges, not dates for this word.

Etymograph / hypoelliptic