exotegmic en · ADJ
Etymology
From exo- + tegmic.
Meanings
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(not-comparable) Pertaining to the outer portion of the integument.
In general, the mature endosperm shows a protein-rich outer layer and exotegmic cells have a zigzag pattern, while the exotesta is siliciferous.
1998, Klaus Kubitzki, H. Huber, The Families and Genera of Vascular Plants: Volume VI: Flowering Plants. Monocotyledons: Alismatanae and Commelinanae (except Gramineae), →ISBN, page 418: