geminate, a. and n.

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A. adj. Duplicated, combined in pairs, twin, binate. geminate leaves , leaves springing in pairs from the same node, one leaf beside the other.
1598 HAKLUYT Voy. I. 340 We desire of your Maiestie to..continue the geminate disposition of your beneuolences, both generally to all our subiects, and also priuately to this our beloued seruant. 1829 LOUDON Encycl. Plants 1099 Geminate, doubled. 1872 OLIVER Elem. Bot. II. 213 Observe the frequently geminate leaves and extra-axillary inflorescence of the Order. 1880 GRAY Struct. Bot. 413/1. 1964 R. H. ROBINS Gen. Ling. iii. 103 Consonants can be long, or geminate, when the closure or obstruction is held momentarily before release. 1967 V. NABOKOV Speak, Memory (ed. 2) vii. 141 Spacious windows alternated with narrower ones, single or geminate, and some of these were of frosted glass.
 
B. n. A doubled consonant.  
1885 COOK tr. Sievers' O.E. Gram. (1887) 99 B..occurs..in medial and final positions as a geminate. 1958 Archivum Linguisticum X. 61 The question of ‘subsidiary’ syllables, perceptibility as against sonority, whispered speech, dipthongs and geminates. 1965 Language XLI. 449 Intervocalic p t k indicate a so-called short geminate; pp tt kk stand for overlong geminates.
 

Hence geminately adv., in pairs, doubly.