IPA: /ˈprɒpəɡjuːl/
KK: /ˈprɒpəˌɡjuːl/
A part of a plant, like a bud or a cutting, that helps it spread and grow into a new plant.
The gardener used a propagule to grow new plants from the existing ones.
Propagule is formed from "propagare" (meaning to propagate or spread) and the suffix "-ule" (meaning small or diminutive). The word "propagule" refers to a small part of a plant that can develop into a new individual, thus relating to the idea of spreading or reproducing.
Think of 'propagating' or 'spreading' something small ('-ule') to remember that a propagule is a small part that can grow into a new plant.