Definition of polytunnel in English:

polytunnel

Line breaks: poly|tunnel
Pronunciation: /ˈpɒlitʌnl/

Entry from British & World English dictionary

noun

An elongated polythene-covered frame under which seedlings or other plants are grown outdoors.

Definition of polytunnel in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal