prothalline
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prothalline — pro·thalline … English syllables
prothallium — prothallial, prothallic, prothalline /proh thal een, uyn/, adj. prothalloid, adj. /proh thal ee euhm/, n., pl. prothallia / thal ee euh/. 1. Bot. the gametophyte of ferns and related plants. 2. the analogous rudimentary gametophyte of seed… … Universalium