Word: posthaste
Part of speech: Adverb
Syllables: post
haste
Definition: quickly, as fast as someone travelling post; with great speed
Morphemes:
Affix: post
Language: en
PoS: Adverb
Meaning: With the post, on post-horses; by a relay of horses (changing at every staging-post); hence, express, with speed, quickly.
Affix: haste
Language: en
PoS: Noun
Meaning: Speed; swiftness; dispatch.
Etymology Compounds: Affix: haste
Language: fro
Decoded: haste
PoS: Noun
Meaning: urgency, haste, speed